CN106271387A - Inside cover the manufacture method of corrosion resisting alloy straight seam welded steel pipe - Google Patents
Inside cover the manufacture method of corrosion resisting alloy straight seam welded steel pipe Download PDFInfo
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- CN106271387A CN106271387A CN201510236481.0A CN201510236481A CN106271387A CN 106271387 A CN106271387 A CN 106271387A CN 201510236481 A CN201510236481 A CN 201510236481A CN 106271387 A CN106271387 A CN 106271387A
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- steel pipe
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a kind of in cover the manufacture method of corrosion resisting alloy straight seam welded steel pipe, including step S4: steel plate both sides are processed as X-type groove and by clean for polishing near groove；Step S5: become to need radian by the clod wash of steel plate both sides；Step S6: steel plate bending is become pipe；Step S7: pipe is carried out joint close and positions backing welding；Step S8: at the groove of steel pipe two ends, arc-extinguishing plate is drawn in welding；Step S9-1: with monofilament submerged arc welding steel pipe inner wall groove；Step S10: submerged arc welding outer wall of steel pipe groove；Step S9-2: bury Tig Welding steel pipe inner wall groove with monofilament；Step S11: remove and draw arc-extinguishing plate；Step S15: steel pipe total length is carried out expanding.Steel pipe is combined into by two kinds of metal materials: outer layer is L415M, and internal layer is corrosion resisting alloy layer LC2242, uses JCOE molding, and automatic welding welds, and weldquality is stable, and efficiency is high.
Description
Technical field
The present invention relates to the manufacture method of a kind of straight seam welded steel pipe, particularly to covering corrosion-resistant conjunction in one
The manufacture method of gold straight seam welded steel pipe.
Background technology
Corrosion is one of 3 kinds of dominant failure modes of component of machine (wear and tear, corrode and tired), corrosion
Problem is directly connected to the every field of national economy, and the direct losses that corrosion causes to alloy material are huge,
Along with industrialized process, etching problem is on the rise, and also comes more to be paid attention to.For conveying corrosive medium
Pipeline for, for preventing pipeline from leaking in-service, destroying, endanger human and environment, corrosion resistant
Erosion property is most important.For solving etching problem, generally use expensive thicker corrosion resisting alloy (resistance to
Resistant alloy intensity is low), or use the thickest cheap high intensity carbon steel add anticorrosive coat (life-span is short,
Poor reliability), a kind of be use high intensity carbon steel laminating with corrosion resisting alloy become composite.
Comparatively speaking, composite is the most economical, reliable and feasible, based on this situation, inside covers corrosion-resistant conjunction
The application of gold steel pipe is the most extensive.But composite is formed by the metal of two kinds of unlike materials is laminating, become
Divide performance difference big, bring problem such as fire check, pore and lack of fusion to hot-working such as welding processing；
The method using manual welding at present, productivity ratio is low, difficult quality guarantee.
Summary of the invention
The technical problem to be solved in the present invention is in order to avoid fire check occurs in weld seam, greatly reduce pore and
The defect of lack of fusion, it is provided that cover the manufacture method of corrosion resisting alloy straight seam welded steel pipe in a kind of, uses
JCOE molding (that is, by steel plate by J-type, c-type, the order molding of O type), automatic welding welds, weldering
Seam steady quality, efficiency is high, is more than the 300% of manual welding.
Covering the manufacture method of corrosion resisting alloy straight seam welded steel pipe in a kind of, its feature is, this manufacturer
Method includes:
Step S4: steel plate dual-side is milled into groove, and by groove and steel plate inside and outside wall both sides 25mm
In the range of clear up, until exposing metallic luster；
Step S5: become to need radian by the clod wash of steel plate both sides；
Step S6: steel plate bending is become pipe；
Step S7: pipe is carried out joint close, forms X-type groove, and use automatic gas shielded welding to enter
Row location backing welding；
Step S8: at the two ends groove of the steel pipe formed, arc-extinguishing plate is drawn in welding；
Step S9-1: using the inwall groove of monofilament submerged arc welding steel pipe, postwelding inwall groove depth is big
In corrosion resisting alloy layer thickness 0.7～1.5mm；
Step S10: use the outer wall groove of multiplewire submerged arc welding welded still pipe；
Step S9-2: use the inwall groove of the monofilament Tig Welding steel pipe of straight polarity direct current method；
Step S11: remove and draw arc-extinguishing plate；
Step S15: steel pipe total length is carried out expanding, to eliminate residual stress, it is ensured that steel pipe overall dimensions
Meet the requirements.
Wherein, step S9-1It is the first time welding of the inwall groove to steel pipe, postwelding inwall groove depth
More than corrosion resisting alloy layer thickness 0.7～1.5mm so that welding for the first time and the interior corrosion resisting alloy covered
Layer also maintains a certain distance, and is really welded in basic unit, and cover in being also not welded to is corrosion-resistant
On alloy-layer, the corrosion resisting alloy layer that so can cover in effectively protecting.Subsequently, step S10, use
The outer wall groove of multiplewire submerged arc welding welded still pipe, completes the welding of outer wall groove, and efficiency is high.Then, step
Rapid S9-2The inwall groove of welded still pipe again, uses monofilament Tig Welding, can avoid welding
In journey, temperature is too high, the corrosion resisting alloy layer effectively covered in protection.The most also it is avoided that because of composition poor performance
Different greatly, to hot-working such as welding processing bring such as problems such as fire check, pore and lacks of fusion.
It is preferred that described steel plate is clad steel plate, basic unit is L415M, and thickness is more than or equal to 12.0mm,
The corrosion resisting alloy layer inside covered is LC2242, and thickness is more than or equal to 3.0mm.
The main raw material(s) covering corrosion resisting alloy straight seam welded steel pipe in manufacture is that L415M+LC2242 is multiple
Closing steel plate, basic unit is L415M (GB/T 9711 oil and gas industry pipeline delivery system steel pipe),
Thickness >=12.0mm, coating is that LC2242 (covers in SY/T 6623 or lining corrosion resisting alloy composite steel tube
Specification), thickness >=3.0mm；Basic unit's chemical composition (max, wt%) is as follows:
Coating chemical composition (max, wt%) is as follows:
Basic unit is L415M, belongs to conventional pipeline low-carbon alloy steel, and its yield strength is 415～565MPa,
Tensile strength is 520～760MPa, has high intensity and toughness, it is ensured that the intensity of steel pipe；Coating
For LC2242, belong to nickel-base alloy, nickel has been simultaneously introduced Cr, Mo element, there is single-phase Ovshinsky
Body structure, has the corrosion resisting property of excellence.It all has in Oxidant and reductant very well
Resistance to corrosion, particularly having F-, Cl-In isoionic oxidizing acid, deposit at aerobic and oxidant
Reproducibility acid in, in the mixed acid of oxidizing acid and reproducibility acid, at wet chlorine with containing the water of chlorine
Solution is respectively provided with the corrosion resistance that other corrosion resistant alloy is difficult to compare, it is ensured that the corrosion resistance of steel pipe.
It is preferred that in step S7In, use 80%Ar+20%CO2Mixed gas, Φ 3.2mm's
The monofilament gas shielded arc welding that MK GX70 welding wire is carried out welds 1 road.
It is preferred that in step S9-1In, use the MK GX70 welding wire of Φ 3.2mm and sintered flux to enter
Row monofilament submerged arc welding 1 road, and control postwelding inwall groove depth more than corrosion resisting alloy layer thickness
1mm。
It is preferred that in step S9-2In, use the SNi6625 nickel-based welding wire of Φ 1.2mm (to meet
GB/T15620-2008 nickel and nickel alloy welding wire) and protect gas 100%Ar to carry out the monofilament of straight polarity direct current method
Tig Welding 3～5 road, between road, temperature is less than or equal to 150 DEG C.
Control temperature between the road of welding, be the corrosion resisting alloy layer in order to cover in effectively protecting, it is ensured that weld seam
The overheated tissue coarse grains that causes is avoided in metal and heat affected area, produces fire check, also ensure that corrosion-resistant
The decay resistance of alloy-layer.
It is preferred that in step S10In, use the MK GX70 welding wire of Φ 4.0mm and sintered flux to enter
Row multiplewire submerged arc welding welds 1 road.
Multiplewire submerged arc welding can be greatly improved welding efficiency, welds 1 road and can complete the weldering to outer wall groove
Connect.
It is preferred that in step S15In, use steel tube expansion steel pipe total length to be carried out cold expanding, to disappear
Except residual stress, and ensure that steel pipe overall dimensions meets the requirements.
It is preferred that this manufacture method is in step S4The most also include:
Step S1: raw material carries out ultrasonic examination, Physicochemical test, and result is qualified could be used；
Step S2: use plasma arc that steel plate is carried out perpendicular cuts to needs size；
Step S3: steel plate is identified.
Those steps are the preparation before steel plate is bent and welded.
It is preferred that this manufacture method is in step S11Afterwards, S15The most also include:
Step S12: butt welded seam carries out radiographic inspection, checks weldquality；
Step S13: butt welded seam carries out ultrasonic examination, checks weldquality；
Step S14: the defective place of butt welded seam reprocesses.
Those steps are inspections to steel pipe after welding.
It is preferred that this manufacture method is in step S15The most also include:
Step S16: steel pipe is carried out alignment, it is ensured that steel pipe linearity meets the requirements；
Step S17: steel pipe is carried out the water pressure test, checks the compactness of steel pipe；
Step S18: butt welded seam carries out ultrasonic examination, weldquality after the inspection water pressure test；
Step S19: sampling carries out Physicochemical test, the performance indications of inspection steel pipe；
Step S20: butt welded seam carries out radiographic inspection, weldquality after the inspection water pressure test；
Step S21: to the welding seam grinding in the range of pipe end 150mm so that it is height is 0～0.5mm；
Step S22: to pipe end machining, make pipe end meet the requirements；
Step S23: steel pipe two ends are carried out hoop ultrasound wave and remanent magnetism detection；
Step S24: measure steel pipe length and weight；
Step S25: inspection steel pipe outward appearance, size printed mark；
Step S26: qualified steel pipe warehouse-in is deposited.
On the basis of meeting common sense in the field, above-mentioned each optimum condition, can combination in any, i.e. get Ben Fa
Bright each preferred embodiments.
The most progressive effect of the present invention is: using JCOE molding, automatic welding welds, weldquality
Stable, efficiency is high, is more than the 300% of manual welding, and weld seam can be avoided fire check occur, significantly subtract
Few defect such as pore and lack of fusion.Further, by first welding inwall groove 1 road, outer wall is welded subsequently
Groove, if then weld inwall groove arterial highway, thus complete the welding of whole X-type groove so that inwall slope
Temperature during mouth welding will not be too high, the corrosion resisting alloy layer covered in being effectively protected, the corrosion resistant inside covered
Erosion alloy-layer can ensure that thickness, and the whole steel pipe various characteristics in commissure also can be guaranteed.And
Compared to directly having welded inwall groove welds outer wall groove again, on the premise of ensureing weldquality, this
The manufacture method of invention can also be greatly promoted working performance.
Accompanying drawing explanation
Fig. 1 is the manufacture method covering corrosion resisting alloy straight seam welded steel pipe in a preferred embodiment of the present invention
Manufacturing flow chart.
Detailed description of the invention
Further illustrate the present invention below by the mode of embodiment, but the most therefore limit the present invention to
Among described scope of embodiments.
Fig. 1 shows the manufacturing process under a specific embodiment of the present invention.Below with reference to the accompanying drawings, it is situated between
Continue manufacture method of the present invention, and it comprises the following steps:
Step S1: raw material carries out UT (Ultrasonic Testing, ultrasonic examination), and physics and chemistry tries
Testing, result is qualified could be used；
Step S2: use plasma arc that steel plate is carried out perpendicular cuts to needs size；
Step S3: steel plate is identified；
Step S4: steel plate dual-side is milled into groove, and by groove and steel plate inside and outside wall both sides 25mm
In the range of clear up, until exposing metallic luster；
Step S5: become to need radian by the clod wash of steel plate both sides；
Step S6: steel plate bending is become pipe；
Step S7: pipe is carried out joint close, forms X-type groove, and use automatic gas shielded welding to enter
Row location backing welding；
Use 80%Ar+20%CO2Mixed gas, the monofilament that the MK GX70 welding wire of Φ 3.2mm is carried out
Gas shielded arc welding welds 1 road, and MK GX70 welding wire can be buied from Yichang Monkey King Welding Wire Co., Ltd., for
Commercially；
Step S8: at the steel pipe two ends groove formed, arc-extinguishing plate is drawn in welding；
Step S9-1: using the inwall groove of monofilament submerged arc welding steel pipe, postwelding inwall groove depth is big
In corrosion resisting alloy layer thickness 0.7～1.5mm；
Use MK GX70 welding wire and sintered flux (solder flux requirement conformance with standard ISO of Φ 3.2mm
14174-S A FB 1AC H5) carry out monofilament submerged arc welding 1 road, it is preferred that control postwelding inwall
Groove depth is more than corrosion resisting alloy layer thickness about 1mm, and MK GX70 welding wire can weld from Yichang Monkey King
Silk company limited buys, for commercially；
Step S10: use the outer wall groove of multiplewire submerged arc welding welded still pipe；
Use MK GX70 welding wire and sintered flux (solder flux requirement conformance with standard ISO of Φ 4.0mm
14174-S A FB 1AC H5) carry out multiplewire submerged arc welding and weld 1 road, MK GX70 welding wire can be from Yichang
Monkey King welding wire company limited buys, for commercially；
Step S9-2: use the inwall groove of the monofilament Tig Welding steel pipe of straight polarity direct current method；
Use Φ 1.2mm SNi6625 (GB/T 15620-2008 nickel and nickel alloy welding wire) welding wire and
Protection gas 100%Ar carries out monofilament Tig Welding 3～5 road of straight polarity direct current method, temperature between road
≤150℃；
Step S11: remove and draw arc-extinguishing plate；
Step S12: butt welded seam carries out RT (Radiographic Testing, radiographic inspection), checks weld seam
Quality；
Step S13: butt welded seam carries out UT, checks weldquality；
Step S14: the defective place of butt welded seam reprocesses；
Step S15: steel pipe total length is carried out expanding, to eliminate residual stress, it is ensured that steel pipe overall dimensions
Meet the requirements；
It is preferred that use steel tube expansion steel pipe total length to be carried out cold expanding；
Step S16: steel pipe is carried out alignment, it is ensured that steel pipe linearity meets the requirements；
Step S17: steel pipe is carried out the water pressure test, checks the compactness of steel pipe；
Step S18: butt welded seam carries out UT, weldquality after the inspection water pressure test；
Step S19: sampling carries out Physicochemical test, the performance indications of inspection steel pipe；
Step S20: butt welded seam carries out RT, weldquality after the inspection water pressure test；
Step S21: to the welding seam grinding in the range of pipe end 150mm so that it is height is 0～0.5mm；
Step S22: to pipe end machining, make pipe end meet the requirements；
Step S23: steel pipe two ends are carried out hoop ultrasound wave and remanent magnetism detection；
Step S24: measure steel pipe length and weight；
Step S25: inspection steel pipe outward appearance, size printed mark；
Step S26: qualified steel pipe warehouse-in is deposited.
By use automatic welding welding method, weldquality is stable, efficiency be manual welding 300% with
On, and can avoid weld seam that fire check occurs, greatly reduce the defect such as pore and lack of fusion.
It will be understood to those skilled in the art that the technical program can not cover corrosion-resistant conjunction in being used only in
In the manufacture of gold (L415M+LC2242) straight seam welded steel pipe, may be equally applicable for other special steel
In the manufacture planted.
Although the foregoing describing the detailed description of the invention of the present invention, but those skilled in the art should managing
Solving, these are merely illustrative of, and protection scope of the present invention is defined by the appended claims.This
The technical staff in field, can be to these embodiment party on the premise of without departing substantially from the principle of the present invention and essence
Formula makes various changes or modifications, but these changes and amendment each fall within protection scope of the present invention.
Claims (10)
1. cover the manufacture method of corrosion resisting alloy straight seam welded steel pipe in one kind, it is characterised in that this system
The method of making includes:
Step S4: steel plate dual-side is milled into groove, and by groove and steel plate inside and outside wall both sides 25mm
In the range of clear up, until exposing metallic luster；
Step S5: become to need radian by the clod wash of steel plate both sides；
Step S6: steel plate bending is become pipe；
Step S7: pipe is carried out joint close, forms X-type groove, and use automatic gas shielded welding to enter
Row location backing welding；
Step S8: at the two ends groove of the steel pipe formed, arc-extinguishing plate is drawn in welding；
Step S9-1: using the inwall groove of monofilament submerged arc welding steel pipe, postwelding inwall groove depth is big
In corrosion resisting alloy layer thickness 0.7～1.5mm；
Step S10: use the outer wall groove of multiplewire submerged arc welding welded still pipe；
Step S9-2: use the inwall groove of the monofilament Tig Welding steel pipe of straight polarity direct current method；
Step S11: remove and draw arc-extinguishing plate；
Step S15: steel pipe total length is carried out expanding, to eliminate residual stress, it is ensured that steel pipe overall dimensions
Meet the requirements.
2. manufacture method as claimed in claim 1, it is characterised in that described steel plate is clad steel plate,
Basic unit is L415M, and thickness is more than or equal to 12.0mm, and the corrosion resisting alloy layer inside covered is LC2242,
Thickness is more than or equal to 3.0mm.
3. manufacture method as claimed in claim 2, it is characterised in that in step S7In, use
80%Ar+20%CO2Mixed gas, the monofilament gas shield that the MK GX70 welding wire of Φ 3.2mm is carried out
Weldering welding 1 road.
4. manufacture method as claimed in claim 2, it is characterised in that in step S9-1In, use
The MK GX70 welding wire of Φ 3.2mm and sintered flux carry out monofilament submerged arc welding 1 road, and control weldering
Rear inwall groove depth is more than corrosion resisting alloy layer thickness 1mm.
5. manufacture method as claimed in claim 2, it is characterised in that in step S9-2In, use
The SNi6625 welding wire of Φ 1.2mm and protection gas 100%Ar carry out the monofilament tungsten argon arc of straight polarity direct current method
Weldering welding 3～5 roads, between road, temperature is less than or equal to 150 DEG C.
6. manufacture method as claimed in claim 2, it is characterised in that in step S10In, use
The MK GX70 welding wire of Φ 4.0mm and sintered flux carry out multiplewire submerged arc welding and weld 1 road.
7. manufacture method as claimed in claim 1, it is characterised in that in step S15In, use steel
Steel pipe total length is carried out cold expanding by pipe expanding machine, to eliminate residual stress, and ensures that steel pipe overall dimensions accords with
Close requirement.
8. manufacture method as claimed in claim 1, it is characterised in that this manufacture method is in step S4
The most also include:
Step S1: raw material carries out ultrasonic examination, Physicochemical test, and result is qualified could be used；
Step S2: use plasma arc that steel plate is carried out perpendicular cuts to needs size；
Step S3: steel plate is identified.
9. manufacture method as claimed in claim 1, it is characterised in that this manufacture method is in step S11
Afterwards, S15The most also include:
Step S12: butt welded seam carries out radiographic inspection, checks weldquality；
Step S13: butt welded seam carries out ultrasonic examination, checks weldquality；
Step S14: the defective place of butt welded seam reprocesses.
10. manufacture method as claimed in claim 1, it is characterised in that this manufacture method is in step
S15The most also include:
Step S16: steel pipe is carried out alignment, it is ensured that steel pipe linearity meets the requirements；
Step S17: steel pipe is carried out the water pressure test, checks the compactness of steel pipe；
Step S18: butt welded seam carries out ultrasonic examination, weldquality after the inspection water pressure test；
Step S19: sampling carries out Physicochemical test, the performance indications of inspection steel pipe；
Step S20: butt welded seam carries out radiographic inspection, weldquality after the inspection water pressure test；
Step S21: to the welding seam grinding in the range of pipe end 150mm so that it is height is 0～0.5mm；
Step S22: to pipe end machining, make pipe end meet the requirements；
Step S23: steel pipe two ends are carried out hoop ultrasound wave and remanent magnetism detection；
Step S24: measure steel pipe length and weight；
Step S25: inspection steel pipe outward appearance, size printed mark；
Step S26: qualified steel pipe warehouse-in is deposited.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510236481.0A CN106271387A (en) | 2015-05-11 | 2015-05-11 | Inside cover the manufacture method of corrosion resisting alloy straight seam welded steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510236481.0A CN106271387A (en) | 2015-05-11 | 2015-05-11 | Inside cover the manufacture method of corrosion resisting alloy straight seam welded steel pipe |
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| CN106271387A true CN106271387A (en) | 2017-01-04 |
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ID=57630640
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| CN201510236481.0A Pending CN106271387A (en) | 2015-05-11 | 2015-05-11 | Inside cover the manufacture method of corrosion resisting alloy straight seam welded steel pipe |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106694610A (en) * | 2017-03-29 | 2017-05-24 | 无锡市蓝博金属制品有限公司 | Preparation process of oil filler pipe |
| CN107159801A (en) * | 2017-07-19 | 2017-09-15 | 浙江义腾特种钢管有限公司 | A kind of pipeline engineering is with large-caliber thin-walled gapless stainless steel tube production technology |
| CN107553072A (en) * | 2017-09-21 | 2018-01-09 | 上海臣泰制管有限公司 | A kind of tube-making process method and tubulation apparatus |
| CN108747215A (en) * | 2018-06-01 | 2018-11-06 | 江阴市三和重工钢制品有限公司 | The manufacturing process of small radius-thickness ratio Q690 grades of arm submerged-arc welded (SAW) pipes |
| CN110788456A (en) * | 2019-10-24 | 2020-02-14 | 番禺珠江钢管（珠海）有限公司 | Multi-wire submerged arc welding process with low weld seam surplus height for thin-wall steel pipe |
| CN115838897A (en) * | 2022-11-18 | 2023-03-24 | 莱芜钢铁集团银山型钢有限公司 | Martensite wear-resistant corrosion-resistant steel pipe for 415 HB-level sediment conveying pipeline and preparation method thereof |
-
2015
- 2015-05-11 CN CN201510236481.0A patent/CN106271387A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106694610A (en) * | 2017-03-29 | 2017-05-24 | 无锡市蓝博金属制品有限公司 | Preparation process of oil filler pipe |
| CN107159801A (en) * | 2017-07-19 | 2017-09-15 | 浙江义腾特种钢管有限公司 | A kind of pipeline engineering is with large-caliber thin-walled gapless stainless steel tube production technology |
| CN107553072A (en) * | 2017-09-21 | 2018-01-09 | 上海臣泰制管有限公司 | A kind of tube-making process method and tubulation apparatus |
| CN108747215A (en) * | 2018-06-01 | 2018-11-06 | 江阴市三和重工钢制品有限公司 | The manufacturing process of small radius-thickness ratio Q690 grades of arm submerged-arc welded (SAW) pipes |
| CN110788456A (en) * | 2019-10-24 | 2020-02-14 | 番禺珠江钢管（珠海）有限公司 | Multi-wire submerged arc welding process with low weld seam surplus height for thin-wall steel pipe |
| CN115838897A (en) * | 2022-11-18 | 2023-03-24 | 莱芜钢铁集团银山型钢有限公司 | Martensite wear-resistant corrosion-resistant steel pipe for 415 HB-level sediment conveying pipeline and preparation method thereof |
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Application publication date: 20170104 |