Aisi 316L Stainless Steel Pipe

1.Product Introduction of the aisi 316l stainless steel pipe : Basic information: Model number: 200 series, 300 Series, 400 series Type: Seamless or welding Standard: ASTM, AISI, GB, JIS Technique: Cold finished, Cold Drawing, Cold rolling, hot extrusion Surface treatment: Annealed &...

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Product Details

1.Product Introduction of the aisi 316l stainless steel pipe:

Basic information:

Model number: 200 series, 300 Series, 400 series

Type: Seamless or welding

Standard: ASTM, AISI, GB, JIS

Technique: Cold finished, Cold Drawing, Cold rolling, hot extrusion

Surface treatment: Annealed & Pickled, Bright Annealing and polished

Model Number scope/ Available Steel Grades:: 201/304/304L/321/316/316l/309s/310s/410/420/430/904l and more

Lead Time:7-15 days after deposit

Certification: MTC

2.Product Parameter And Application of the aisi 316l stainless steel pipe:

Diameter: 6mm-660mm or customized

Length: 1000-6000mm or Customized, We will custom saw cut to length.

Thickness:0.2-100mm 1mm-40mm or customized

Surface: Polish or Pickling

Ends: PE/Plain Ends

Special use: Instrument, decoration, construction, utensils and so on

3.Chemical composition:

Grade

C  ≤

Si  ≤

Mn  ≤

P  ≤

S  ≤

Ni  ≤

Cr  ≤

201

0.12

0.75

7.00

0.045

0.045

1.00-1.28

13.70-15.70

202

0.15

1.00

2.25

0.045

0.045

4.07-4.17

14.00-16.00

304

0.08

0.75

2.00

0.045

0.03

8.00-11.00

18.00-20.00

304L

0.035

0.75

2.00

0.045

0.03

8.00-13.00

18.00-20.00

309

0.15

0.75

2.00

0.045

0.03

12.00-15.00

22.00-24.00

310S

0.08

1.50

2.00

0.045

0.03

19.00-22.00

24.00-26.00

316

0.08

1.00

2.00

0.045

0.03

10.00-14.00

16.00-18.00

316L

0.035

0.75

2.00

0.045

0.03

10.00-15.00

16.00-18.00

321

0.04-0.10

0.75

2.00

0.045

0.03

9.00-13.00

17.00-20.00

405

0.08

0.75

1.00

0.045

0.03

0.06

11.5-13.5

409

0.089

1.00

1.00

0.045

0.05

0.06

10.50-11.75

410

0.15

0.75

1.00

0.045

0.03

0.06

11.5-13.5

420

0.16-0.25

1.00

1.00

0.040

0.03

0.06

12.00-14.00

430

0.12

0.75

1.00

0.045

0.03

0.06

16.00-18.00

904L

0.02

1.0

2.00

0.045

0.03

23.00-28.00

19.00-23.00

4.Shipping And Package of the aisi 316l stainless steel pipe:

1. Shipping:We will arrange the shipment within 7---15 working days after we get the order

2.Package :Standard seaworthy package(wooden boxes package and other package or as your requirements).

Welding Process Requirements for 316L Stainless Steel Pipe

1.Welding Method

According to the characteristics of stainless steel, as far as possible to reduce the amount of heat input, so the use of manual arc welding, argon arc welding two methods. d> φ159mm adopts argon arc welding to bottom, manual arc welding cover surface and d<φ159mm argon arc welding. Welding machine adopts manual arc welding/Argon arc welding Dual-purpose WS7-400 inverter arc welder.

2.Welding Materials

Austenitic stainless steel is a special steel, in order to meet the joint has the same performance, should follow the "equal components" principle to select welding materials. At the same time, in order to enhance the joint resistance to thermal cracking and intergranular corrosion capacity, so that a small number of ferrite joints, select HooCr19Ni12Mo2 Argon arc welding wire. Manual arc welding electrode CHS022 as filler material.

3.Welding Parameters

Austenitic stainless steel is a prominent feature of the thermal sensitivity, so the use of small current, rapid welding, multi-layer welding to strictly control the temperature between the layers, so that the temperature between the layers is less than 60 ℃.

4.Groove Form and Assembly Position Welding

Groove in the form of V-shaped groove. Due to the use of small welding current, deep penetration, so the blunt edge of the groove is smaller than carbon steel, about 0-0.5mm, the slope angle is larger than carbon steel, about 65-70 degrees. Because the thermal expansion coefficient of stainless steel is relatively large, welding stress is larger. Strict positioning welding is required. For d≤φ89mm pipeline use two point positioning. d=φ89-φ219mm uses three-point positioning. The D≥φ219mm adopts four-point positioning to locate the weld length 6-8mm.

5.Welding Technical Requirements

⑴ Manual arc welding Welder adopts DC reverse connection, and Argon arc welding adopts direct current connection

⑵ welding wire with stainless steel wire brush off the surface of the oxidized skin, and with acetone wash. The electrode should be dried at a temperature of 200-250 degrees for 1 hours. Each welder is fitted with an insulated barrel, and the baked electrodes are loaded into the heat-insulated barrels, with the accompanying use.

⑶ welding before the workpiece groove on both sides of the 25mm range of oil and other cleaning, and with acetone to clean the sides of the slope of the 25mm range.

⑷ Argon arc welding stainless steel, the back must be filled with argon protection, in order to ensure back molding. The flow of argon in the pipeline is 5-14l/min and the positive argon flow rate is 12-13l/min.

⑸ welding, weld thickness should be as thin as possible, and the root fused well. When the arc is in the form of a gentle slope. If there is an arc shrinkage, the grinder should be worn off. Arc quenching must be done in the groove, and the arc pits should be filled to prevent the cracks.

⑹ because the stainless steel is austenitic stainless steel, in order to prevent the carbonization of precipitation sensitization and intergranular corrosion, should strictly control the interlayer temperature and the cooling speed after welding. Require the temperature control between the layers under 60 ℃, after welding must be immediately water-cooled, at the same time using sectional welding. This symmetrical and dispersed welding sequence can not only increase the cooling speed of the joint, but also reduce the welding stress.

6.Results

⑴ appearance inspection no pores, weld tumor, sunken, and bite edge defects, forming good.

⑵ the specimen is stretched. Bending experiment, all the mechanical properties are met the requirements did not find the failure of fusion and crack.

⑶ Macroscopic metallographic examination, found that the weld is fused well. Melted deeply 1-1.5mm. Microscopic metallographic examination, its parent material and heat affected area are austenite organization, weld metal is austenite + ferrite (4%) tissue. It fully satisfies the requirements of intergranular corrosion and brittleness, and ensures the quality of welding engineering.

5.Recommendations

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