CN104989034A - Construction prestress pull rod and manufacturing method thereof - Google Patents
Construction prestress pull rod and manufacturing method thereof Download PDFInfo
- Publication number
- CN104989034A CN104989034A CN201510277950.3A CN201510277950A CN104989034A CN 104989034 A CN104989034 A CN 104989034A CN 201510277950 A CN201510277950 A CN 201510277950A CN 104989034 A CN104989034 A CN 104989034A
- Authority
- CN
- China
- Prior art keywords
- connecting portion
- bar
- main part
- prestressed draw
- round steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a construction prestress pull rod and a manufacturing method thereof. The construction prestress pull rod is made by processing of round steel and has a U-shaped appearance. The construction prestress pull rod consists of: connection parts, which are provided with connecting threads; and a main body part, which is disposed at one ends of the connection parts, and is processed from the same round steel for processing of the connection parts. Two connection parts are respectively disposed at two ends of the main body part. The manufacturing method of the construction prestress pull rod mainly includes: smelting, hot rolling, blanking, isothermal normalizing, coarse machining, bending processing, two quenching heat treatment, fine machining, flaw detection and warehousing. The construction prestress pull rod provided by the invention has the advantages of moderate manufacturing cost, high mechanical strength, good corrosion resistance, and wide adaptation range.
Description
Technical field
The present invention relates to a kind of building materials, particularly relate to a kind of prestressed draw-bar for building and manufacture method thereof.
Background technology
Prestressed draw-bar for building, as the important component building long span building thing, harbour dock and bridge construction, is mainly used in object of construction production structure by prestressed position and environment.High-strength prestress pull bar is widely used in underground building as super highrise building ground, ship lock, harbour, dock and subway tunnel, at surface structures as numerous areas such as stadiums, conference and exhibition center, railway terminal Waiting Lounge, museum, nuclear power station and bridges.Prestressed draw-bar is bear tensile stress connector in building structure, plays a part very important.At present, the manufacturing technology of the high-strength prestress pull bar below domestic yield strength 550MPa level is ripe, and other prestressed draw-bar of 650MPa level higher level, be still in the development stage, carbon medium alloy constructional steel in main use.In order to ensure the obdurability index that prestressed draw-bar is high, during large gauge reinforcing pull rod adopts usually, carbon CrNiMo alloy structure Steel material, if 40CrNiMoA etc., Ni content is more than 1.25%, causes cost of production higher.
Summary of the invention
The object of the invention is for the problems referred to above, a kind of mechanical strength is high, decay resistance is high and cost of production is moderate one prestressed draw-bar for building and manufacture method thereof are provided.
For reaching above-mentioned purpose, the invention provides a kind of prestressed draw-bar for building, this prestressed draw-bar for building is processed into by round steel, and described prestressed draw-bar for building comprises:
Connecting portion, described connecting portion is provided with connecting thread, and described connecting portion is used for being connected to external environment condition by prestressed draw-bar for building;
Main part, described main part is arranged on one end of described connecting portion, and described main part and described connecting portion are processed into by same round steel; Described connecting portion is provided with two sections, and described connecting portion is separately positioned on the two ends of described main part.
Further, described main part profile takes the shape of the letter U, and the inner bend radius r1 of described main part is 80-100mm, and the outside sweep radius r 2 of described main part is 160-200mm, and the diameter d of described main part is 100-120mm; The diameter e of described connecting portion is 106-126mm, and the length a of described connecting portion is 600-800mm;
The length c of the bend of described main part is 500-700mm, and described bend is 1500-2000mm to the distance b of described connecting portion outer face;
The material composition of described round steel is by mass percentage: carbon 0.08% ~ 0.18%, silicon 0.42% ~ 0.80%, manganese 1.10% ~ 1.35%, chromium 1.20% ~ 1.40%, nickel 0.40% ~ 0.60%, phosphorus 0 ~ 0.012%, sulphur 0 ~ 0.012%, titanium 0.02% ~ 0.03%, vanadium 0.020% ~ 0.042%, compound rare-earth 0.16-0.18%, cadmium 0.02% ~ 0.05%, boron 0.0040% ~ 0.0055%, oxygen≤0.0012%, nitrogen≤0.0060%, hydrogen≤0.0001%, arsenic≤0.010%, plumbous≤0.010%, tin≤0.010%, antimony≤0.010%, surplus is iron and other trace impurities inevitable, described compound rare-earth is Gd 12-16%, Pr 8-10%, Er 14-16%, Ho 13-15%, Nd 10-12%, Sm 8-10% by mass percentage, and surplus is Tm.
For achieving the above object, present invention also offers a kind of method manufacturing above-mentioned prestressed draw-bar for building, the method comprises the steps:
A. smelt: desulfurizing iron is skimmed, converter smelting, slag-stopping tapping, ladle deoxidation alloy rare earth, liquid steel refining; Converter adopts desulphurised hot metal to smelt, and double slag process highcasting speed is tapped, and improves Cleanliness of Molten Steel, ensures that the phosphorus in steel is less than 0.012%; Converter terminal carbon controls 0.08% ~ 0.18%, and temperature controls at 1580 ~ 1600 DEG C; Slag-stopping tapping, top of the slag thickness 0 ~ 55mm;
Add deoxidier-Si-Ca-Ba in converter tapping process, carry out molten steel final deoxidizing, adopt ferromanganese, ferrosilicon, ferronickel and compound rare-earth to carry out alloy rare earth; Utilize calcium carbide to carry out top of the slag deoxidation in LF stove refining process, after oxygen is less than 10ppm, add ferrotianium Argon 4 ~ 5 minutes, flow is 400 ~ 420NL/min; Boron line is added within 3 ~ 5 minutes; Feeding silicon-calcium wire 2.5m/ ton steel, argon blowing rate 60 ~ 100NL/min, argon blowing time impelled large inclusions fully to float at 25 ~ 30 minutes;
B. hot rolling: billet continuous casting, high speed round steel mill milling, roll rear controlled cooling model; Continuous casting adopts full guard cast, and tundish adopts alkaline covering agent;
Billet heating temperature is 1080 ~ 1150 DEG C, and start rolling temperature is 1030 ~ 1100 DEG C, and finishing temperature is 820 ~ 860 DEG C, misting cooling, keeps its cooling velocity of 5 ~ 8 DEG C/sec, ensures the structure property of round steel;
C. blanking: adopt band saw blanking, round steel cutting length is (2b+c+5) mm;
D. isothermal normalizing: the round steel after blanking is carried out isothermal normalizing conditioning treatment, heating-up temperature is 925-935 DEG C, and temperature retention time is 2.5-3.5 hour, and the air-cooled time is 600-800 second, and isothermal temperature is 600-610 DEG C, and isothermal temperature is 3.5-4.0 hour;
E. thick machine: adopt machine that the main part of prestressed draw-bar and connecting portion are machined to target size+1.5mm;
F. bending machining: adopt hot bending method that the blank that machine is good is bent to U-shaped prestressed draw-bar;
G. twice quenching heat treatment: the prestressed draw-bar of brake forming is heated to 880-910 DEG C, insulation 3-3.5 hour, water-cooled below oil cooling to 350 DEG C, was heated to 600-620 DEG C after 30 seconds, insulation 2.5-3.0 hour; Again described prestressed draw-bar is heated to 870-900 DEG C, insulation 2.5-3.0 hour, below oil cooling to 350 DEG C, is heated to 550-560 DEG C of insulation 3.5-4 hour;
H. smart machine: adopt machine that main part and connecting portion are machined to target size, and process connecting thread;
I. ultrasonic testing/ ultrasonic examination, by qualified products packaging warehouse-in.
Beneficial effect:
Compared with prior art, the advantage of this prestressed draw-bar for building and manufacture method thereof is: 1, U-shaped profile considerably increases the stability of prestressed draw-bar, and the diameter of connecting portion 6mm larger than the diameter of main part, thus after making connecting portion be processed to form connecting thread, its inside diameter is still suitable with main part, thus ensure that the mechanical strength of connecting portion; Outside sweep radius is the twice of inner bend radius, more effectively prevents the resilience after pull bar bending forming.2, adopt unique steel chemical composition, decrease the content of nickel, a small amount of with the addition of compound rare-earth, can either ensure mechanical strength and the decay resistance of prestressed draw-bar, additionally reduce cost; 3, have employed isothermal normalizing conditioning treatment, substantially improve the structure property of prestressed draw-bar, adopt the heat treatment method of twice quenching when finished heat treatment, and optimize each heat treatment parameter, the performance of steel is improved further.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prestressed draw-bar for building of the present invention.
Fig. 2 is the manufacture method schematic flow sheet of prestressed draw-bar for building of the present invention.
Detailed description of the invention
Prestressed draw-bar for building
Prestressed draw-bar for building comprises:
Connecting portion, described connecting portion is provided with connecting thread, and described connecting portion is used for being connected to external environment condition by prestressed draw-bar for building;
Main part, described main part is arranged on one end of described connecting portion, and described main part and described connecting portion are processed into by same round steel; Described connecting portion is provided with two sections, and described connecting portion is separately positioned on the two ends of described main part, and described main part profile takes the shape of the letter U.
Embodiment one
As shown in Figure 1-2, the inner bend radius r1 of described main part is 80mm, and the outside sweep radius r 2 of described main part is 160mm, and the diameter d of described main part is 100mm; The diameter e of described connecting portion is 106mm, and the length a of described connecting portion is 600mm;
The length c of the bend of described main part is 500mm, and described bend is 1500mm to the distance b of described connecting portion outer face;
The material composition of described round steel is by mass percentage: carbon 0.16%, silicon 0.58%, manganese 1.25%, chromium 1.38%, nickel 0.48%, phosphorus 0.008%, sulphur 0.006%, titanium 0.028%, vanadium 0.039%, compound rare-earth 0.17%, cadmium 0.05%, boron 0.0045%, oxygen≤0.0012%, nitrogen≤0.0060%, hydrogen≤0.0001%, arsenic≤0.010%, plumbous≤0.010%, tin≤0.010%, antimony≤0.010%, surplus is iron and other trace impurities inevitable; Described compound rare-earth is Gd 14%, Pr 9%, Er 16%, Ho 13%, Nd 10.5%, Sm 10% by mass percentage, and surplus is Tm.
For achieving the above object, present invention also offers a kind of method manufacturing above-mentioned prestressed draw-bar for building, the method comprises the steps:
A. smelt: desulfurizing iron is skimmed, converter smelting, slag-stopping tapping, ladle deoxidation alloy rare earth, liquid steel refining; Converter adopts desulphurised hot metal to smelt, and double slag process highcasting speed is tapped, and improves Cleanliness of Molten Steel, ensures that the phosphorus in steel is less than 0.012%; Converter terminal carbon controls 0.16%, and temperature controls at 1580 DEG C; Slag-stopping tapping, top of the slag thickness 35mm;
Add deoxidier-Si-Ca-Ba in converter tapping process, carry out molten steel final deoxidizing, adopt ferromanganese, ferrosilicon, ferronickel and compound rare-earth to carry out alloy rare earth; Utilize calcium carbide to carry out top of the slag deoxidation in LF stove refining process, after oxygen is less than 10ppm, add ferrotianium Argon 4 minutes, flow is 420NL/min; Boron line is added within 3 minutes; Feeding silicon-calcium wire 2.5m/ ton steel, argon blowing rate 100NL/min, argon blowing time impelled large inclusions fully to float at 25 minutes;
B. hot rolling: billet continuous casting, high speed round steel mill milling, roll rear controlled cooling model; Continuous casting adopts full guard cast, and tundish adopts alkaline covering agent;
Billet heating temperature is 1150 DEG C, and start rolling temperature is 1100 DEG C, and finishing temperature is 860 DEG C, misting cooling, keeps its cooling velocity of 8 DEG C/sec, ensures the structure property of round steel;
C. blanking: adopt band saw blanking, round steel cutting length is (2b+c+5) mm;
D. isothermal normalizing: the round steel after blanking is carried out isothermal normalizing conditioning treatment, heating-up temperature is 925 DEG C, and temperature retention time is 2.5 hours, and the air-cooled time is 600 seconds, and isothermal temperature is 600 DEG C, and isothermal temperature is 3.5 hours;
E. thick machine: adopt machine that the main part of prestressed draw-bar and connecting portion are machined to target size+1.5mm;
F. bending machining: adopt hot bending method that the blank that machine is good is bent to U-shaped prestressed draw-bar;
G. twice quenching heat treatment: the prestressed draw-bar of brake forming is heated to 900 DEG C, is incubated 3 hours, and water-cooled below oil cooling to 350 DEG C, was heated to 600 DEG C, is incubated 2.5 hours after 30 seconds; Again described prestressed draw-bar is heated to 900 DEG C, is incubated 2.5 hours, below oil cooling to 350 DEG C, be heated to 550 insulation 3.5 hours;
H. smart machine: adopt machine that main part and connecting portion are machined to target size, and process connecting thread;
I. ultrasonic testing/ ultrasonic examination, by qualified products packaging warehouse-in.
Embodiment two
As shown in Figure 1-2, the inner bend radius r1 of described main part is 100mm, and the outside sweep radius r 2 of described main part is 200mm, and the diameter d of described main part is 120mm; The diameter e of described connecting portion is 126mm, and the length a of described connecting portion is 800mm;
The length c of the bend of described main body section is 700mm, and described bend is 2000mm to the distance b of the outer section of described connecting portion;
The material composition of described round steel is by mass percentage: carbon 0.18%, silicon 0.66%, manganese 1.10%, chromium 1.40%, nickel 0.45%, phosphorus 0.009%, sulphur 0.010%, titanium 0.03%, vanadium 0.042%, compound rare-earth 0.18%, cadmium 0.05%, boron 0.0055%, oxygen≤0.0012%, nitrogen≤0.0060%, hydrogen≤0.0001%, arsenic≤0.010%, plumbous≤0.010%, tin≤0.010%, antimony≤0.010%, surplus is iron and other trace impurities inevitable; Described compound rare-earth is Gd 16%, Pr 8%, Er 16%, Ho 13.6%, Nd 12%, Sm 8.5% by mass percentage, and surplus is Tm.
For achieving the above object, present invention also offers a kind of method manufacturing above-mentioned prestressed draw-bar for building, the method comprises the steps:
A. smelt: desulfurizing iron is skimmed, converter smelting, slag-stopping tapping, ladle deoxidation alloy rare earth, liquid steel refining; Converter adopts desulphurised hot metal to smelt, and double slag process highcasting speed is tapped, and improves Cleanliness of Molten Steel, ensures that the phosphorus in steel is less than 0.012%; Converter terminal carbon controls 0.18%, and temperature controls at 1600 DEG C; Slag-stopping tapping, top of the slag thickness 55mm;
Add deoxidier-Si-Ca-Ba in converter tapping process, carry out molten steel final deoxidizing, adopt ferromanganese, ferrosilicon, ferronickel and compound rare-earth to carry out alloy rare earth; Utilize calcium carbide to carry out top of the slag deoxidation in LF stove refining process, after oxygen is less than 10ppm, add ferrotianium Argon 5 minutes, flow is 400NL/min; Boron line is added within 5 minutes; Feeding silicon-calcium wire 2.5m/ ton steel, argon blowing rate 60NL/min, argon blowing time impelled large inclusions fully to float at 30 minutes;
B. hot rolling: billet continuous casting, high speed round steel mill milling, roll rear controlled cooling model; Continuous casting adopts full guard cast, and tundish adopts alkaline covering agent;
Billet heating temperature is 1150 DEG C, and start rolling temperature is 1100 DEG C, and finishing temperature is 860 DEG C, misting cooling, keeps its cooling velocity of 8 DEG C/sec, ensures the structure property of round steel;
C. blanking: adopt band saw blanking, round steel cutting length is (2b+c+5) mm;
D. isothermal normalizing: the round steel after blanking is carried out isothermal normalizing conditioning treatment, heating-up temperature is 935 DEG C, and temperature retention time is 3.5 hours, and the air-cooled time is 800 seconds, and isothermal temperature is 610 DEG C, and isothermal temperature is 4.0 hours;
E. thick machine: adopt machine that the main part of prestressed draw-bar and connecting portion are machined to target size+1.5mm;
F. bending machining: adopt hot bending method that the blank that machine is good is bent to U-shaped prestressed draw-bar;
G. twice quenching heat treatment: the prestressed draw-bar of brake forming is heated to 910 DEG C, is incubated 3.5 hours, and water-cooled below oil cooling to 350 DEG C, was heated to 620 DEG C, is incubated 3.0 hours after 30 seconds; Again described prestressed draw-bar is heated to 900 DEG C, is incubated 3.0 hours, below oil cooling to 350 DEG C, be heated to 560 DEG C of insulations 4 hours;
H. smart machine: adopt machine that main part and connecting portion are machined to target size, and process connecting thread;
I. ultrasonic testing/ ultrasonic examination, by qualified products packaging warehouse-in.
Finally to should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention but not limiting the scope of the invention; although be explained in detail the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (3)
1. a prestressed draw-bar for building, this prestressed draw-bar for building is processed into by round steel, and described prestressed draw-bar for building comprises:
Connecting portion, described connecting portion is provided with connecting thread, and described connecting portion is used for being connected to external environment condition by prestressed draw-bar for building;
Main part, described main part is arranged on one end of described connecting portion, and described main part and described connecting portion are processed into by same round steel;
It is characterized in that, described connecting portion is provided with two sections, and described connecting portion is separately positioned on the two ends of described main part.
2. prestressed draw-bar for building as claimed in claim 1, is characterized in that:
Described main part profile takes the shape of the letter U, and the inner bend radius r1 of described main part is 80-100mm, and the outside sweep radius r 2 of described main part is 160-200mm, and the diameter d of described main part is 100-120mm; The diameter e of described connecting portion is 106-126mm, and the length a of described connecting portion is 600-800mm;
The length c of the bend of described main part is 500-700mm, and described bend is 1500-2000mm to the distance b of described connecting portion outer face;
The material composition of described round steel is by mass percentage: carbon 0.08% ~ 0.18%, silicon 0.42% ~ 0.80%, manganese 1.10% ~ 1.35%, chromium 1.20% ~ 1.40%, nickel 0.40% ~ 0.60%, phosphorus 0 ~ 0.012%, sulphur 0 ~ 0.012%, titanium 0.02% ~ 0.03%, vanadium 0.020% ~ 0.042%, compound rare-earth 0.16-0.18%, cadmium 0.02% ~ 0.05%, boron 0.0040% ~ 0.0055%, oxygen≤0.0012%, nitrogen≤0.0060%, hydrogen≤0.0001%, arsenic≤0.010%, plumbous≤0.010%, tin≤0.010%, antimony≤0.010%, surplus is iron and other trace impurities inevitable, described compound rare-earth is Gd 12-16%, Pr 8-10%, Er 14-16%, Ho 13-15%, Nd 10-12%, Sm 8-10% by mass percentage, and surplus is Tm.
3. manufacture a method for the arbitrary prestressed draw-bar for building of the claims 1-2, the method comprises the steps:
A smelts: desulfurizing iron is skimmed, converter smelting, slag-stopping tapping, ladle deoxidation alloy rare earth, liquid steel refining; Converter adopts desulphurised hot metal to smelt, and double slag process highcasting speed is tapped, and improves Cleanliness of Molten Steel, ensures that the phosphorus in steel is less than 0.012%; Converter terminal carbon controls 0.08% ~ 0.18%, and temperature controls at 1580 ~ 1600 DEG C; Slag-stopping tapping, top of the slag thickness 0 ~ 55mm;
Add deoxidier-Si-Ca-Ba in converter tapping process, carry out molten steel final deoxidizing, adopt ferromanganese, ferrosilicon, ferronickel and compound rare-earth to carry out alloy rare earth; Utilize calcium carbide to carry out top of the slag deoxidation in LF stove refining process, after oxygen is less than 10ppm, add ferrotianium Argon 4 ~ 5 minutes, flow is 400 ~ 420NL/min; Boron line is added within 3 ~ 5 minutes; Feeding silicon-calcium wire 2.5m/ ton steel, argon blowing rate 60 ~ 100NL/min, argon blowing time impelled large inclusions fully to float at 25 ~ 30 minutes;
B hot rolling: billet continuous casting, high speed round steel mill milling, roll rear controlled cooling model; Continuous casting adopts full guard cast, and tundish adopts alkaline covering agent;
Billet heating temperature is 1080 ~ 1150 DEG C, and start rolling temperature is 1030 ~ 1100 DEG C, and finishing temperature is 820 ~ 860 DEG C, misting cooling, keeps its cooling velocity of 5 ~ 8 DEG C/sec, ensures the structure property of round steel;
C blanking: adopt band saw blanking, round steel cutting length is (2b+c+5) mm;
D isothermal normalizing: the round steel after blanking is carried out isothermal normalizing conditioning treatment, heating-up temperature is 925-935 DEG C, and temperature retention time is 2.5-3.5 hour, and the air-cooled time is 600-800 second, and isothermal temperature is 600-610 DEG C, and isothermal temperature is 3.5-4.0 hour;
The thick machine of e: adopt machine that the main part of prestressed draw-bar and connecting portion are machined to target size+1.5mm;
F bending machining: adopt hot bending method that the blank that machine is good is bent to U-shaped prestressed draw-bar;
G twice quenching heat treatment: the prestressed draw-bar of brake forming is heated to 880-910 DEG C, insulation 3-3.5 hour, water-cooled below oil cooling to 350 DEG C, was heated to 600-620 DEG C after 30 seconds, insulation 2.5-3.0 hour; Again described prestressed draw-bar is heated to 870-900 DEG C, insulation 2.5-3.0 hour, below oil cooling to 350 DEG C, is heated to 550-560 DEG C of insulation 3.5-4 hour;
H essence machine: adopt machine that main part and connecting portion are machined to target size, and process connecting thread;
I ultrasonic testing/ ultrasonic examination, by qualified products packaging warehouse-in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510277950.3A CN104989034A (en) | 2015-05-21 | 2015-05-21 | Construction prestress pull rod and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510277950.3A CN104989034A (en) | 2015-05-21 | 2015-05-21 | Construction prestress pull rod and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104989034A true CN104989034A (en) | 2015-10-21 |
Family
ID=54300915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510277950.3A Pending CN104989034A (en) | 2015-05-21 | 2015-05-21 | Construction prestress pull rod and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104989034A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111055995A (en) * | 2019-12-31 | 2020-04-24 | 南京儒一航空机械装备有限公司 | Main beam body not easy to deform and processing technology thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012694A (en) * | 2007-02-05 | 2007-08-08 | 华南理工大学 | Concrete beam with built-in transverse prestressed reinforcing steel bar |
| CN101633999A (en) * | 2009-05-26 | 2010-01-27 | 山西太钢不锈钢股份有限公司 | Austenitic stainless steel, steel tube thereof and manufacturing method thereof |
| CN202280204U (en) * | 2011-06-21 | 2012-06-20 | 上海隧道工程股份有限公司 | Lossless connection fastener for steel reinforcement cage |
| WO2012131579A1 (en) * | 2011-03-30 | 2012-10-04 | Rand York Castings (Proprietary) Limited | Steel bar |
-
2015
- 2015-05-21 CN CN201510277950.3A patent/CN104989034A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012694A (en) * | 2007-02-05 | 2007-08-08 | 华南理工大学 | Concrete beam with built-in transverse prestressed reinforcing steel bar |
| CN101633999A (en) * | 2009-05-26 | 2010-01-27 | 山西太钢不锈钢股份有限公司 | Austenitic stainless steel, steel tube thereof and manufacturing method thereof |
| WO2012131579A1 (en) * | 2011-03-30 | 2012-10-04 | Rand York Castings (Proprietary) Limited | Steel bar |
| CN202280204U (en) * | 2011-06-21 | 2012-06-20 | 上海隧道工程股份有限公司 | Lossless connection fastener for steel reinforcement cage |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111055995A (en) * | 2019-12-31 | 2020-04-24 | 南京儒一航空机械装备有限公司 | Main beam body not easy to deform and processing technology thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102634735B (en) | Spring steel used for automobile suspension as well as preparation method and application thereof | |
| CN102534424B (en) | Stainless steel, stainless steel wire for bridge pull sling as well as preparation methods and application thereof | |
| CN103361569B (en) | A kind of Ultralow temperature weather-proof structural steel plate and production method thereof | |
| CN101311288B (en) | Wire rod for producting1770Mpa bridge cable galvanized steel wire and method for manufacturing same | |
| CN102703808B (en) | Steel for 300MPa-grade automobile structural part and production method for steel | |
| CN101892432A (en) | Manufacturing method of X70QS seamless line pipe for acid environment | |
| CN105506500B (en) | A kind of high strength wire rod and its manufacture method with superior low-temperature performance | |
| CN101376951B (en) | High strength wire rod for bridge stay cable and suspended cable galvanized steel wire, and manufacturing method thereof | |
| CN103521946A (en) | High-strength austenitic stainless steel submerged-arc welding wire | |
| CN103317256A (en) | Austenitic stainless steel submerged-arc welding wire with excellent high-temperature strength | |
| CN103556069A (en) | Large-diameter seamless steel tube for high-pressure gas cylinders and manufacturing method thereof | |
| CN105925899A (en) | Quenched and tempered X52 hydrogen sulfide corrosion resisting seamless line pipe and preparation method thereof | |
| CN1970811B (en) | High-strength cold-roll-forming structural steel and method for producing same | |
| CN102851579A (en) | Nb-containing micro-alloyed high-carbon steel hot-rolled wire rod and manufacturing method thereof | |
| CN104328338A (en) | Small-scale finish-rolled twisted steel and production method thereof | |
| CN111187969A (en) | Production method of 400 MPa-level niobium-nitrogen microalloyed twisted steel | |
| CN101643882A (en) | Clean steel smelting method of anti-S steel oil well pipe | |
| EP4089199B1 (en) | Low temperature-resistant hot-rolled h-type steel for 355mpa marine engineering and preparation method therefor | |
| CN103484766A (en) | Hardened and tempered high-strength and low-weld crack sensitivity steel plate for 600MPa-level water-power engineering and preparing method thereof | |
| WO2022099680A1 (en) | Converter and continuously-cast small billet-based production method for npr rock bolt or anchor cable novel material | |
| CN103290338A (en) | Rare earth-containing seamless steel tube for L690Q pipeline and production method thereof | |
| CN102978538B (en) | Smelting process for production of grade II hot-rolled reinforced bar | |
| CN104131238A (en) | High-formability high-weatherability ultrathin hot-rolled steel plate and CSP (compact strip production) technology thereof | |
| CN114932338A (en) | Wire rod for high-titanium gas shielded welding wire and production process thereof | |
| CN101543837B (en) | Method for manufacturing Fe-Mn-C series high-manganese steel thin strip by continuous casting and tandem rolling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151021 |