CN1151304C - Low-carbon low-alloy steel and pipe - Google Patents
Low-carbon low-alloy steel and pipe Download PDFInfo
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- CN1151304C CN1151304C CNB011266112A CN01126611A CN1151304C CN 1151304 C CN1151304 C CN 1151304C CN B011266112 A CNB011266112 A CN B011266112A CN 01126611 A CN01126611 A CN 01126611A CN 1151304 C CN1151304 C CN 1151304C
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 25
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 44
- 239000010959 steel Substances 0.000 claims abstract description 44
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000010949 copper Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 9
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052796 boron Inorganic materials 0.000 claims abstract description 4
- 239000010955 niobium Substances 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 3
- 239000011733 molybdenum Substances 0.000 claims abstract description 3
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 3
- 239000011574 phosphorus Substances 0.000 claims abstract description 3
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 3
- 239000010703 silicon Substances 0.000 claims abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 3
- 239000011593 sulfur Substances 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract 2
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 239000011572 manganese Substances 0.000 claims description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052729 chemical element Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 15
- 238000003466 welding Methods 0.000 abstract description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 abstract 1
- 238000005496 tempering Methods 0.000 description 18
- 238000005096 rolling process Methods 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 238000010791 quenching Methods 0.000 description 8
- 230000000171 quenching effect Effects 0.000 description 8
- 238000009628 steelmaking Methods 0.000 description 8
- 239000010936 titanium Substances 0.000 description 7
- 238000009749 continuous casting Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
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- 238000004458 analytical method Methods 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 101000702393 Homo sapiens Signal peptide peptidase-like 2B Proteins 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The present invention relates to low-carbon low-alloy steel and a pipe prepared from the low-carbon low-alloy steel, which belongs to the field of metallic steel. The present invention aims to increase the toughness and enhance the hardenability and the welding performance of alloy steel. The low-carbon low-alloy steel of the present invention comprises the following elements: 0.10 to 0.16% of carbon, 0.20 to 0.40% of silicon, 1.00 to 1.35% of manganese, 0.02 to 0.035% of aluminum, 0.07 to 0.13% of vanadium, 0.05 to 0.25% of nickel, 0.0005 to 0.0035% of boron, at most 0.010% of phosphorus, at most 0.0005% of sulfur, at most 0.01% of molybdenum, at most 0.20% of copper, at most 0.01% of niobium and balance of iron and trace impurity. The low-carbon low-alloy steel of the present invention can be made into X60 to X80 steel degrees of line pipes or pipe materials with similar strength and grade of steel.
Description
Technical Field
The invention belongs to the field of metal steel, and particularly relates to low-carbon low-alloy steel and a pipe manufactured by the same.
Background
With the continuous development of the world petroleum industry, the pipeline transportation oil and gas has greater advantages than other transportation means due to the characteristics of safety, reliability, economy, energy conservation, high efficiency and the like, and the construction of oil and gas pipelines in the world is rapidly developed, wherein the pipe for transportation gradually develops from the original strength level lower than 56KSI to the strength levels of 60KSI and 80KSI, and part of the pipe for engineering even reaches the strength level of 100 KSI.
Products with strength grades of 60KSI to 80KSI have no specific material composition detail in industry standards, such as American standard API SPEC 5L of pipeline pipes, only have the requirement of minimum impurity element content, and products meeting the standard requirements cannot be produced according to the requirement.
The latest 2000 edition of API SPEC 5L requires that the carbon equivalent of pipeline pipes below X70 must be below 0.43, even for the X80 steel grades, which are required to be as low as possible. If produced according to the formulations of U.S. Pat. Nos. 5,226,978 and 5,186,769 (referred to as references below), the carbon equivalent is generally above 0.43 and must exceed the standard requirements. The carbon equivalent as in example 2 and example 3 of the aforementioned U.S. patent is 0.44 and 0.46, respectively, both exceeding the standard requirements, resulting in poor weldability.
Because the pipe manufacturing scheme proposed by the reference is on-line rolling and cooling control, especially a continuous rolling and stretch reducing matched unit is needed, a forced cooling system is needed after the continuous rolling unit and the stretch reducing unit, the production control is difficult, part of manufacturers need to make larger equipment modification, the investment is quite large, and even some manufacturers cannot successfully modify the equipment. Therefore, the practicability is not strong.
The latest 2000 edition of API SPEC 5L has a PSL1 grade and a PSL2 grade, and for the PSL2 grade, the product has extremely strict requirements on X60-X80 steel grade, namely yield strength, tensile strength and impact toughness. The strength has the requirement of upper and lower limits, the maximum allowable variation range of the yield strength is 154MPa, and the maximum allowable variation range of the tensile strength is 241 MPa. The minimum requirement for impact toughness is greater than 41 joules (J). The pipeline pipe is produced by the pipe manufacturing scheme proposed by the reference, and due to the limitation of the rolling process, the uniformity of the head and the tail ends of the final formed product is poor, the strength fluctuation is large, and the yield strength is difficult to control within 154 MPa. Meanwhile, the transverse and longitudinal differences of the impact toughness are large due to the banded distribution of the rolling structure of the in-line rolled product, and 41 joules (J) cannot be reached. Therefore, the reference is applicable only to the PSL1 level, and is not applicable to the PSL2 level.
In addition, in the reference, the content of Ti element is between 0.010 and 0.014, which is bad for the production quality of the electric furnace continuous casting tube blank, and the surface of the tube blank is cracked to finally influence the rolling quality of the tube.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide low-carbon low-alloy steel and a pipe made of the low-carbon low-alloy steel so as to increase the strength and toughness of the alloy steel and improve the hardenability and the welding performance. The alloy of the invention is beneficial to producing seamless steel tube products by continuous casting.
The invention is realized according to the following technical scheme:
the low-carbon low-alloy steel comprises the following chemical elements in percentage by weight:
carbon (C): 0.10-0.16%;
silicon (Si): 0.20-0.40%;
manganese (Mn): 1.00-1.35%;
aluminum (Al): 0.02-0.035%;
vanadium (V): 0.07-0.13%;
nickel (Ni): 0.05-0.25%;
boron (B): 0.0005 to 0.0035%;
phosphorus (P): less than or equal to 0.010 percent;
sulfur (S): less than or equal to 0.005 percent;
molybdenum (Mo): less than or equal to 0.01 percent;
copper (Cu): less than or equal to 0.20 percent;
niobium (Nb): less than or equal to 0.01 percent;
iron (Fe) and trace impurities: and (4) the balance.
According to the element proportion, the low-carbon low-alloy steel is subjected to a common quenching and tempering treatment process, the quenching heat preservation time is more than 30 minutes, the tempering heat preservation time is more than 45 minutes, seamless, welded high-strength and high-toughness pipes of X60, X65, X70 and X80 steel grades or other related steel grades are produced, the pipes comprise steel pipes or various steel pipe products made of the steel pipes, and the pipes can be used for oil and gas recovery in oil fields or other industries.
The invention has the beneficial effects that:
compared with the reference, the low-carbon low-alloy steel of the invention has the following differences in component formula and strengthening principle, and has the remarkable advantages that:
1) the strengthening elements are different, and the strengthening elements adopted in the reference are vanadium (V) + titanium (Ti). The strengthening elements of the invention are vanadium (V) + nickel (Ni). V, Ti is a carbide-forming element which can refine grains and improve toughness by precipitation strengthening, but reduces the austenite phase region and reduces the hardenability of the alloy. Ni is a non-carbide forming element, can enlarge an austenite phase region, increase toughness and improve hardenability. On the other hand, when the Ti content is between 0.010 and 0.014%, the production quality of the electric furnace continuous casting tube blank is not good, and the surface of the tube blank is cracked to finally affect the rolling quality of the tube.
2) The content of vanadium element is different from the reference. The weight percentage composition of the V element of the invention is 0.07-0.13%, and the weight percentage composition of the V element of the comparison patent is 0.10-0.16%. All utilize V to strengthen, but the vanadium content of the alloy of the invention is lower, the welding performance is slightly superior.
3) The nickel content is different from that of the comparative patent. The Ni element of the present invention is 0.05 to 0.25% by weight, while the comparative document does not have this element. The alloy of the present invention has a slightly better hardenability.
4) The content of titanium element is different from that of the comparative patent. The Ti element of the invention is a non-additive element and is carried along with scrap steel in steelmaking, and the weight percentage of the Ti element in the comparative patent is 0.008-0.012%.
The alloy of the invention is beneficial to continuous casting production and the surface quality of the final seamless steel pipe product.
5) The content of the boron element (B) is different from that of the comparative literature. The weight percentage of the element B in the invention is 0.0005-0.0035%. Whereas the reference does not contain this element. Therefore, the alloy of the invention has better hardenability.
The low-carbon low-alloy steel has the following advantages in the production of steel pipe manufacturing enterprises:
1) the chemical composition has low carbon content and alloy content, the deformation resistance is small during rolling, the rolling is easy, and compared with the rolling process of other conventional products, the process does not need to change and is easy to roll qualified products.
2) The same tube blank can be used for producing the applicable tube blank with high steel grade strength and wide steel grade range, can meet the requirements of different users on different steel grades, and can greatly reduce the tube blank inventory cost of a tube manufacturing plant.
3) The production is easy, and the heat treatment production can be carried out only by a manufacturer with a tempering production line. And even if the pipe manufacturing factory can not carry out heat treatment, other factories with heat treatment capability can be entrusted to carry out outsourcing processing. Can simultaneously adapt to the PSL1 level and the PSL2 level of the API SPEC 5L-2000 standard.
Referring to fig. 1 and 2, fig. 1 is a graph of supercooling austenite isothermal transformation temperature (CCT curve) of example 1 of the present invention, and fig. 2 is a graph of hardenability of U-shaped sample, and it can be seen from the curves that the hardenability of the material of the present invention is good. FIG. 3 shows the rolled structure of a large production sample, the structure being ferrite and pearlite. FIG. 4 is a quenched microstructure of a large production sample, the microstructure being martensite, and it can be seen that the material of the present invention has been fully quenched. FIG. 5 is a structure diagram of tempered sorbite.
Drawings
FIG. 1: supercooled austenite isothermal transition temperature curve (CCT curve) of example 1
FIG. 2: example 1 sample U-type hardenability Curve
Wherein,actual hardness value
Average hardness number
FIG. 3: rolled microstructure of alloy of example 1
FIG. 4: quenching structure diagram of alloy of example 1
FIG. 5: tempered structure diagram of alloy of example 1
FIG. 6: EXAMPLE 1 yield Strength of Material after tempering at different temperatures
Wherein,
minimum value of X80 yield strength
Maximum value of X80 yield strength
Minimum value of X60 yield strength
FIG. 7: EXAMPLE 1 tensile Strength of Material after tempering at different temperatures
Wherein,
lowest value of X80 tensile strength
Highest value of X80 tensile strength
Lowest value of X60 tensile strength
Highest value of X60 tensile strength
Detailed Description
Example 1
150 tons of steel produced by electric furnace continuous casting in an electric furnace branch factory of Bao steel-making department according to the weight percentage of the designed chemical components are rolled into 139.70 × 7.72 steel pipes in a steel pipe branch company of Bao steel-making department, and the steel pipes are processed into X60-X80 steel grade pipeline pipes according to different tempering systems. Randomly taking two pipes as a finished product, and analyzing the components, wherein the specific chemical components are as follows:
weight percent of
Element(s)
Analysis 1 analysis 2
C 0.151 0.146
Si 0.229 0.232
Mn 1.108 1.101
P 0.007 0.010
S 0.003 0.005
V 0.089 0.085
Al 0.023 0.022
Ni 0.062 0.072
Cu 0.044 0.044
B 0.0019 0.0019
Residual amount of other (Fe and impurities)
The rolled mechanical properties of the above pipes are as follows:
longitudinal impact
Yield MPa tensile strength MPa% elongation%
J
1 347 509 40.5 142
2 339 502 40.0 134
3 343 507 40.5 138
After quenching at 910 ℃, tempering at 600-700 ℃ respectively, and keeping the temperature for 60 minutes, wherein the mechanical property distribution is shown in fig. 6 and 7.
When the field tempering temperature is 695 ℃, the quality of the material is shown in the following table, and the requirement of X60 steel grade PSL II grade pipeline pipe is met:
yield tensile strength
Serial number
Elongation% longitudinal impact J
MPa MPa
1 491 595 31.0 112
2 493 586 31.5 114
3 489 585 31.5 115
4 491 589 30.0 114
5 486 580 34.0 114
6 500 595 32.0 118
When the field tempering temperature is 665 ℃, the quality of the material is shown in the following table, and the requirement of X80 steel grade PSL II grade pipeline pipe is met:
tensile strength
Serial number yield MPa
Elongation% longitudinal impact J
MPa
1 594 669 26.0 102
2 603 670 26.0 99
3 592 672 28.0 98
4 586 669 26.5 100
5 596 672 27.5 102
6 584 675 25.5 100
Example 2
150 tons of steel produced by electric furnace continuous casting in an electric furnace branch factory of Bao steel-making department according to the weight percentage of the designed chemical components are rolled into 139.70 × 9.17 steel pipes in a steel pipe branch company of Bao steel-making department, and the steel pipes are processed into X60-X80 steel grade pipeline pipes according to different tempering systems. Randomly taking two pipes as a finished product, and analyzing the components, wherein the specific chemical components are as follows:
weight percent of
Element(s)
Analysis 1 analysis 2
C 0.148 0.144
Si 0.267 0.259
Mn 1.077 1.081
P 0.011 0.011
S 0.006 0.005
V 0.110 0.112
Al 0.028 0.029
Ni 0.013 0.014
Cu 0.086 0.095
B 0.0022 0.0020
Residual amount of other (Fe and impurities)
After quenching at 910 ℃, the field tempering temperature is 670 ℃, and when the heat is preserved for 60 minutes, the quality of the material objects is shown in the following table, which meets the requirements of X80 steel grade PSL II grade pipeline pipes:
longitudinal impact
Serial number yield MPa tensile strength MPa elongation%
J
1 594 690 28.0 98
2 576 693 29.0 106
3 586 689 29.5 99
4 613 702 28.5 96
After quenching at 910 ℃, the field tempering temperature is 680 ℃, and when the heat is preserved for 60 minutes, the quality of the material objects is shown in the following table, which meets the requirements of X70 steel grade PSL II grade pipeline pipes:
longitudinal impact
Serial number yield MPa tensile strength MPa elongation%
J
1 545 659 32.0 102
2 530 671 33.5 116
3 541 667 32.5 109
4 529 656 34.0 120
After quenching at 910 ℃, the field tempering temperature is 640 ℃, and when the heat is preserved for 60 minutes, the quality of the material objects is shown in the following table, which meets the requirements of the sleeve of N80 steel grade:
longitudinal impact
Serial number yield MPa tensile strength MPa elongation%
J
1 640 759 24.0 87
2 648 785 25.5 93
3 638 776 25.5 80
4 632 791 23.5 89
Example 3
According to the weight percentage of the chemical components designed by the invention, the small furnace smelting is carried out in a steelmaking workshop of a product room of the Bao Steel technology center, and the plates with the thickness of 20mm and 30mm are finally formed by forging and rolling, and the specific chemical components are as follows:
weight percent of
Element(s)
20mm 30mm
C 0.164 0.156
Si 0.276 0.269
Mn 1.197 1.220
P 0.007 0.006
S 0.005 0.005
V 0.089 0.085
Al 0.008 0.012
Ni 0.089 0.085
Cu 0.069 0.081
B 0.0017 0.0019
Residual amount of other (Fe and impurities)
After the steel is quenched at 910 ℃ and the tempering temperature is 700 ℃, the quality of the material is shown in the following table, and the requirement of X60 steel grade PSL II grade pipeline pipe is met:
yield tensile strength
Serial number
Elongation% longitudinal impact J
MPa MPa
1 510 602 30.5 128
2 496 607 29.5 131
When the field tempering temperature is 670 ℃, the pipeline pipe meeting X80 steel grade PSL II grade can be produced, and the quality of the material object is as follows:
yield tensile strength
Serial number
Elongation% longitudinal impact J
MPa MPa
1 609 700 26.5 98
2 601 692 25.5 101
Example 4
According to the weight percentage of the chemical components designed by the invention, the small furnace smelting is carried out in a steelmaking workshop of a product room of the Bao Steel technology center, and the plates with the thickness of 20mm and 30mm are finally formed by forging and rolling, and the specific chemical components are as follows:
weight percent of
Element(s)
20mm 30mm
C 0.121 0.119
Si 0.353 0.358
Mn 1.182 1.210
P 0.009 0.008
S 0.006 0.005
V 0.105 0.095
Al 0.009 0.012
Ni 0.012 0.015
Cu 0.076 0.090
B 0.0020 0.0018
Residual amount of other (Fe and impurities)
After the steel is quenched at 910 ℃ and the tempering temperature is 700 ℃, the quality of the material is shown in the following table, and the requirement of X60 steel grade PSL II grade pipeline pipe is met:
yield tensile strength
Serial number
Elongation% longitudinal impact J
MPa MPa
1 510 602 30.5 128
2 496 607 29.5 131
When the field tempering temperature is 670 ℃, the pipeline pipe meeting X80 steel grade PSL II grade can be produced, and the quality of the product is as follows:
yield tensile strength
Serial number
Elongation% longitudinal impact J
MPa MPa
1 609 700 26.5 98
2 601 692 25.5 101
Example 5
The steel-making workshop of the product room of the Bao Steel technology center carries out small-furnace smelting, and plates with the thickness of 20mm and 30mm are finally formed through forging and rolling, and the specific chemical components are as follows:
weight percent of
Element(s)
20mm 30mm
C 0.152 0.148
Si 0.356 0.362
Mn 1.275 1.283
P 0.009 0.008
S 0.007 0.008
V 0.108 0.110
Al 0.025 0.022
Ni 0.014 0.014
Cu 0.090 0.090
B 0.0018 0.0019
Residual amount of other (Fe and impurities)
After quenching at 910 ℃, the field tempering temperature is 670 ℃, and when the heat is preserved for 60 minutes, the quality of the material objects is shown in the following table, which meets the requirements of L80-1 steel grade sleeves:
longitudinal impact
Serial number yield MPa tensile strength MPa elongation%
J
1 594 698 26.0 91
2 599 713 28.5 96
3 623 722 29.5 97
4 613 702 28.0 92
Claims (5)
1. A low-carbon low-alloy steel is characterized in that: comprises the following chemical elements in percentage by weight:
carbon: 0.10-0.16%;
silicon: 0.20-0.40%;
manganese: 1.00-1.35%;
aluminum: 0.02-0.035%;
vanadium: 0.07-0.13%;
nickel: 0.05-0.25%;
boron: 0.0005 to 0.0035%;
phosphorus: less than or equal to 0.010 percent;
sulfur: less than or equal to 0.005 percent;
iron and trace impurities: and (4) the balance.
2. The low carbon low alloy steel of claim 1, wherein: also comprises
Copper: less than or equal to 0.20 percent.
3. The low carbon low alloy steel of claim 1 or 2, wherein: also comprises
Niobium: less than or equal to 0.01 percent;
molybdenum: less than or equal to 0.01 percent.
4. Use of a low carbon low alloy steel according to claim 1 or 2, characterized in that: can be used for manufacturing X60-X80 steel grade pipeline pipes or pipes with similar strength steel grade.
5. Use of a low carbon low alloy steel according to claim 3, characterized in that: can be used for manufacturing X60-X80 steel grade pipeline pipes or pipes with similar strength steel grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011266112A CN1151304C (en) | 2001-08-31 | 2001-08-31 | Low-carbon low-alloy steel and pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011266112A CN1151304C (en) | 2001-08-31 | 2001-08-31 | Low-carbon low-alloy steel and pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1403616A CN1403616A (en) | 2003-03-19 |
| CN1151304C true CN1151304C (en) | 2004-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011266112A Expired - Fee Related CN1151304C (en) | 2001-08-31 | 2001-08-31 | Low-carbon low-alloy steel and pipe |
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| Country | Link |
|---|---|
| CN (1) | CN1151304C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1318631C (en) * | 2004-06-30 | 2007-05-30 | 宝山钢铁股份有限公司 | Method for producing high strength high toughness X80 pipeline steel and its hot-rolled plate |
| CN100463993C (en) * | 2007-02-28 | 2009-02-25 | 天津钢管集团股份有限公司 | Low carbon equivalent micro-alloy steel pipe and on-line normalizing process thereof |
| KR20120004472A (en) * | 2009-04-24 | 2012-01-12 | 아리한트 도메스틱 어플라이언스이즈 리미티드 | A low carbon welded tube and process of manufacture thereof |
| CN101643162B (en) * | 2009-08-24 | 2011-04-13 | 徐国平 | Textile aluminum cylindrical tube and preparation method thereof |
| CN102021492B (en) * | 2009-09-15 | 2012-11-28 | 鞍钢股份有限公司 | Low-carbon low-alloy wear-resistant steel and production method thereof |
| CN103388110A (en) * | 2013-07-18 | 2013-11-13 | 广东韶钢松山股份有限公司 | A method for improving a thick gauge X60 pipeline steel block hammer performance |
| CN104789858B (en) * | 2015-03-20 | 2017-03-08 | 宝山钢铁股份有限公司 | A kind of economical low temperature seamless pipe being applied to 75 DEG C and its manufacture method |
| CN110643884A (en) * | 2019-10-10 | 2020-01-03 | 南京钢铁股份有限公司 | Production method of one-steel multi-stage pipeline steel blank |
| CN110842484A (en) * | 2019-11-28 | 2020-02-28 | 河北恒通管件集团有限公司 | Process for manufacturing hot-pressing low-temperature tee joint by utilizing X60 steel plate |
-
2001
- 2001-08-31 CN CNB011266112A patent/CN1151304C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1403616A (en) | 2003-03-19 |
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