CN102319941A - Welding technique for super duplex stainless steel thin-walled pipes - Google Patents
Welding technique for super duplex stainless steel thin-walled pipes Download PDFInfo
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Abstract
The invention provides a welding technique for super duplex stainless steel thin-walled pipes. The welding technique includes the following steps: (1) the adoption of an all-position V-shaped groove type butt weld; (2) the choice of a welding method and a welding material: argon tungsten arc welding (GTAW) is adopted; in the chemical components in the chosen welding wire, Wni is equal to or larger than 9.5 percent, WCr is equal to or larger than 25.36 percent, WMo is equal to or larger than 3.96 percent, and Wn is equal to or less than 0.35 percent and equal to or larger than 0.23 percent; (3) during welding, controlling the input of welding heat at 1.0KJ/mm to 1.5KJ/mm and the welding interlayer temperature at less than 100 DEG C. The welding technique has the advantages that: the proportion of the weld to the heat-affect zone can be within a reasonable range, moreover, mechanical properties are good, and a welding head can have good anti-pitting property.
Description
Technical field
The present invention relates to a kind of welding procedure, particularly a kind of welding procedure of super-duplex stainless steel light-wall pipe.
Background technology
For Cr25 type dual phase steel, when its anti-spot corrosion index greater than 40 the time, be called super-duplex stainless steel.At room temperature contain delta ferrite and γ austenitic microstructure simultaneously, the single-phase content of engineering use two phase stainless steel is necessary>30%, have the two-phase advantage; The composition characteristic of modern Cr25 type dual phase steel is on the basis of Cr25Ni5Mo alloy system; Further improve Mo, N content is with resistance to corrosion and the structure stability that improves such shaped steel; Some also adds a certain amount of Cu and W, further improves its resistance to corrosion.Work as Mo, N content is controlled at the upper limit of composition range, and when adding a certain amount of Cu and W, its anti-spot corrosion index (PREN) becomes super dual phase steel usually greater than 40.
Existing super on the market dual phase steel mainly contains ASME SA790 S32750 and S32760.It has strong intensity and resistance to corrosion, and it has stronger resisting chlorides corrosive power, higher thermal conductivity and lower thermal coefficient of expansion.Higher chromium, molybdenum and nitrogen content make it have the ability of very high anti-spot erosion, crevice corrosion and general corrosion.Its impact strength is also very high.Be mainly used in chemical process, petrochemical industry and undersea device.Connecting line has extensively been used super dual phase steel in the oil gas treating apparatus, and its thickness is 1.5-5.88mm, and this type of pipeline walls is thin, carries out the welding of super-duplex stainless steel light-wall pipe for a kind of suitable welding method at present.
Summary of the invention
Therefore in order to overcome the problem that above-mentioned prior art exists; The invention provides a kind of welding procedure of super-duplex stainless steel light-wall pipe; The ratio mutually that not only can make weld seam and heat affected area is at zone of reasonableness, and good mechanical properties, can also make soldering tip have good corrosion resistance.
The present invention adopts following technical scheme:
A kind of welding procedure of super-duplex stainless steel light-wall pipe may further comprise the steps:
1) adopts the V-butt form butt weld of full position;
2) selection of welding method and welding material: adopt argon tungsten-arc welding GTAW, select in the chemical composition in the welding wire W for use
Ni>=9.5%, W
Cr>=25.36%, W
Mo>=3.96%, 0.35%>=W
N>=0.23%;
Control sweating heat input quantity is 1.0-1.5KJ/mm when 3) welding, and weld interpass temperature is below 100 ℃.
Among the present invention, the welding wire specification is Φ 1.6mm-2.4mm.
Among the present invention, bevel angle a is 35 ± 2.5 °, and gap b is 2-4mm, root face p1-1.5mm.
Among the present invention, the weld layer number of times is 1 or 2 layer, and electric current is 60-70A, and voltage is 12-14V, and speed of welding is 40-50mm/min.
Beneficial effect of the present invention:
The ratio mutually that not only can make weld seam and heat affected area is at zone of reasonableness, and good mechanical properties, can also make soldering tip have good corrosion resistance.
Figure of description
Divided edge structure sketch map when Fig. 1 welds for the present invention.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is explained further details, so that those skilled in the art better understand the present invention.
The welding procedure of super-duplex stainless steel light-wall pipe may further comprise the steps:
1) groove type: adopt the V-butt butt weld, the welding position is full position, and bevel angle is 35 ± 2.5 °, and gap b is 2-4, root face p1-1.5mm;
2) selection of welding method and welding material: adopt argon tungsten-arc welding GTAW, select in the chemical composition in the welding wire W for use
Ni>=9.5%, W
Cr>=25.36%, W
Mo>=3.96%, 0.35%>=W
N>=0.23%, the welding wire specification is Φ 1.6mm-2.4mm;
Control sweating heat input quantity is 0.5-1.5KJ/mm when 3) welding, and weld interpass temperature is below 100 ℃.
The welding level is 2 layers, and welding parameter is following:
Specify as follows:
1 mother metal
Super-duplex stainless steel commonly used, its chemical composition and mechanical property such as table 1 and table 2.
The chemical composition of table 1 S32750
The mechanical property of table 2 S32750
2 welding materials
Through screening, selected wlding brand is used for argon tungsten-arc welding (GTAW) for Sandvik 25.10.4.L, and deposited metal composition is seen table 3.
Table 3 deposited metal composition
Welding does not need preheating, and the sweating heat input is strict controlled in 0.5-1.5KJ/mm in the welding process, and weld interpass temperature is below 100 ℃; Bevel for welding form and size are as shown in Figure 1; Bevel angle a is 35 ± 2.5 °, and gap b is 2-4, root face p1-1.5mm; The welding level is 2 layers, welding parameter such as table 4:
The welding procedure of table 4 super-duplex stainless steel light-wall pipe
3 result of the tests
3.1Common mechanical test
After welding is accomplished, permeate (PT) and ray (RT) and detect, all obtain intact result.According to related request stretch, common mechanics performance tests such as bending and hardness, hardness adopts Vickers (HV10), is measured as between 256 to 286; The fusion area is that hardness is the highest; Take second place in the weld metal zone, mother metal is minimum, and stretching and crooked result see table 5 and table 6.
Table 5 tension test
Table 6 bend test
3.2The phase ratio detects
Establishing criteria requires that welded specimen is carried out the phase ratio and detects, and the artificial pointwise counting method of test employing system is measured the test method of bulk factor, measures the phase ratio of each ten visual field of welding line joint mother metal, weld seam and position, heat affected area, result such as table 7.
Table 7 ferrite content (%)
Can know by table 7; The austenite content of weld metal zone is between 40%-55%; The heat affected area austenite content is between 50%-70%, and the contained austenite content in mother metal, weld metal zone and heat affected area is 64.5%, 46.3% and 62.7%; All in the 30-70% scope, these phase ratios can guarantee that welding point has satisfactory each item excellent properties.
The spot corrosion experiment
Establishing criteria requires welded specimen is carried out the spot corrosion experiment, is processed as 3.05mm * 25mm * 50mm to sample, and sample (contains 20%HNO at solvent earlier
3And 5%HF), cleans water flushing after 5 minutes under 60 ℃ of temperature, and then in acetone, soak, after the air drying, put into ten thousand/gram balance afterwards again and weigh.Be about 6% in concentration, temperature is the FeCl of 40 ℃ (deviation is ± 1 ℃)
3Take out through weighing and microscopic examination behind water flushing, banister brush cleaning, acetone and the air drying after soaking 72h in the solution fully, obtain result such as table 8.
Table 8 spot corrosion experimental result
Can know the corrosion through 72 hours according to the result, spot corrosion does not take place in sample, and weightless mean value is 0.36g/m
2, have good pitting corrosion resistant performance, satisfy the environment for use requirement of mother metal.
4 conclusions
When (1) welding S32750 super-duplex stainless steel light-wall pipe; Without preheating before the weldering, postwelding does not need heat treatment, and the control of interlayer temperature is most important; Guarantee that interlayer temperature is below 100 ℃; A bit of its temperature of need surveying of every weldering, in the hope of the interlayer temperature of light-wall pipe all the time in the reasonable scope, hot input quantity is controlled at 1.0-1.5KJ/mm can obtain rational phase proportion and outstanding corrosion resistance.
(2) ratio mutually of using weld seam that welding procedure described herein obtains and heat affected area all in reasonable range, the mechanical property experiment well, welding point has good corrosion resistance.
Claims (4)
1. the welding procedure of a super-duplex stainless steel light-wall pipe is characterized in that, may further comprise the steps:
1) adopts the V-butt form butt weld of full position;
2) selection of welding method and welding material: adopt argon tungsten-arc welding GTAW, select in the chemical composition in the welding wire W for use
Ni>=9.5%, W
Cr>=25.36%, W
Mo>=3.96%, 0.35%>=W
N>=0.23%;
Control sweating heat input quantity is 1.0-1.5KJ/mm when 3) welding, and weld interpass temperature is below 100 ℃.
2. according to the welding procedure of the said super-duplex stainless steel light-wall pipe of claim 1, it is characterized in that: the welding wire specification is Φ 1.6mm-2.4mm.
3. according to the welding procedure of the said super-duplex stainless steel light-wall pipe of claim 1, it is characterized in that: bevel angle a is 35 ± 2.5 °, and gap b is 2-4mm, and root face p is 1-1.5mm.
4. according to the welding procedure of the said super-duplex stainless steel light-wall pipe of claim 1, it is characterized in that: the weld layer number of times is 1 layer or 2 layers, and electric current is 60-70A, and voltage is 12-14V, and speed of welding is 40-50mm/min.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104416269A (en) * | 2013-08-30 | 2015-03-18 | 上海凯泉泵业（集团）有限公司 | Super duplex stainless steel argon tungsten-arc welding method |
| CN104972201A (en) * | 2014-04-08 | 2015-10-14 | 沈阳鼓风机集团核电泵业有限公司 | Method for overlaying Co-Cr-W hard alloy on super duplex stainless steel substrate |
| GB2546661A (en) * | 2015-12-23 | 2017-07-26 | Goodwin Plc | A steel, a welding consumable, a cast, forged or wrought product, a method of welding, a welded product and a method of heat treating |
| CN107234319A (en) * | 2017-07-14 | 2017-10-10 | 玉环县金龙欧浴洁具有限公司 | Thin plate corrugated stainless steel tubing pipe crimping welding procedure |
| CN107378289A (en) * | 2017-07-28 | 2017-11-24 | 江苏宝金来管道成套设备有限公司 | Ultra-thin bellows-welding technique |
| CN108115256A (en) * | 2017-11-23 | 2018-06-05 | 南通象屿海洋装备有限责任公司 | A kind of ship takes over docking automatic TIG welding technique with stainless steel tube |
| CN109530875A (en) * | 2018-12-26 | 2019-03-29 | 无锡市优工精密阀门有限公司 | The method of super-duplex stainless steel casting technique hole welding |
| CN109590583A (en) * | 2018-10-24 | 2019-04-09 | 河钢股份有限公司 | The gas protection welding process of 980MPa grades of cold-rolled biphase steel plate |
| CN110369836A (en) * | 2019-06-26 | 2019-10-25 | 中船澄西船舶修造有限公司 | A kind of welding procedure of the duplex phase stainless tube of chemical tanker Underwater Emission pipe |
| CN111822821A (en) * | 2020-06-16 | 2020-10-27 | 山西汾西机电有限公司 | Welding method and system for super duplex stainless steel |
| KR20210069097A (en) * | 2018-12-28 | 2021-06-10 | 닛테츠 스테인레스 가부시키가이샤 | Welded structure and its manufacturing method |
| CN113681126A (en) * | 2021-08-31 | 2021-11-23 | 烟台中集来福士海洋工程有限公司 | Welding process of super duplex stainless steel dissimilar high alloy materials |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104416269A (en) * | 2013-08-30 | 2015-03-18 | 上海凯泉泵业（集团）有限公司 | Super duplex stainless steel argon tungsten-arc welding method |
| CN104972201A (en) * | 2014-04-08 | 2015-10-14 | 沈阳鼓风机集团核电泵业有限公司 | Method for overlaying Co-Cr-W hard alloy on super duplex stainless steel substrate |
| EP3763476A1 (en) * | 2015-12-23 | 2021-01-13 | Goodwin Plc | A welding consumable, a method of welding and a welded product |
| GB2546661A (en) * | 2015-12-23 | 2017-07-26 | Goodwin Plc | A steel, a welding consumable, a cast, forged or wrought product, a method of welding, a welded product and a method of heat treating |
| GB2546661B (en) * | 2015-12-23 | 2018-04-25 | Goodwin Plc | A welding consumable, a method of welding, and a welded product |
| JP7230102B2 (en) | 2015-12-23 | 2023-02-28 | グッドウィン ピーエルシー | Steel, welding consumables, cast or forged or drawn products, welding methods, welded products, and heat treatment methods |
| JP2021142567A (en) * | 2015-12-23 | 2021-09-24 | グッドウィン ピーエルシーGoodwin Plc | Steel, welding consumable, cast, forged or wrought product, method of welding, welded product and method of heat treating |
| CN107234319A (en) * | 2017-07-14 | 2017-10-10 | 玉环县金龙欧浴洁具有限公司 | Thin plate corrugated stainless steel tubing pipe crimping welding procedure |
| CN107378289A (en) * | 2017-07-28 | 2017-11-24 | 江苏宝金来管道成套设备有限公司 | Ultra-thin bellows-welding technique |
| CN108115256A (en) * | 2017-11-23 | 2018-06-05 | 南通象屿海洋装备有限责任公司 | A kind of ship takes over docking automatic TIG welding technique with stainless steel tube |
| CN109590583A (en) * | 2018-10-24 | 2019-04-09 | 河钢股份有限公司 | The gas protection welding process of 980MPa grades of cold-rolled biphase steel plate |
| CN109530875A (en) * | 2018-12-26 | 2019-03-29 | 无锡市优工精密阀门有限公司 | The method of super-duplex stainless steel casting technique hole welding |
| KR20210069097A (en) * | 2018-12-28 | 2021-06-10 | 닛테츠 스테인레스 가부시키가이샤 | Welded structure and its manufacturing method |
| CN113227409A (en) * | 2018-12-28 | 2021-08-06 | 日铁不锈钢株式会社 | Welded structure and method for manufacturing same |
| KR102520119B1 (en) | 2018-12-28 | 2023-04-10 | 닛테츠 스테인레스 가부시키가이샤 | Welded structure and its manufacturing method |
| CN110369836A (en) * | 2019-06-26 | 2019-10-25 | 中船澄西船舶修造有限公司 | A kind of welding procedure of the duplex phase stainless tube of chemical tanker Underwater Emission pipe |
| CN111822821A (en) * | 2020-06-16 | 2020-10-27 | 山西汾西机电有限公司 | Welding method and system for super duplex stainless steel |
| CN113681126A (en) * | 2021-08-31 | 2021-11-23 | 烟台中集来福士海洋工程有限公司 | Welding process of super duplex stainless steel dissimilar high alloy materials |
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Application publication date: 20120118 |