Stainless Steel Pipe 316L

Stainless Steel Pipe 316L

stainless steel pipe 316l stainless steel pipe 316l is commonly used in pulp and paper equipment heat exchanger, dyeing equipment, film washing equipment, pipelines, coastal area buildings outside the material, as well as high-grade watch bracelet, case and so on. Seawater in equipment,...
Product description

Stainless Steel Pipe 316L

stainless steel pipe 316l is commonly used in pulp and paper equipment heat exchanger, dyeing equipment, film washing equipment, pipelines, coastal area buildings outside the material, as well as high-grade watch bracelet, case and so on. Seawater in equipment, chemicals, dyes, paper, oxalic acid, fertilizers and other production equipment, photo, food industry, coastal facilities, ropes, CD rod, bolts, nuts.


1 cold-rolled product appearance luster is good, beautiful;

2 due to the addition of Mo, corrosion resistance, especially pitting corrosion performance excellent;

3 Excellent high temperature strength

4 Excellent processing hardening (weak magnetic after processing)

5) The state of solid dissolved non-magnetic;

6 compared with 304 stainless steel, the price is higher.

Scope of Application

Pipeline, heat exchanger, food industry, chemical Industry, watch industry, etc.

Chemical Composition(%)

C ≤ 0.03

Si ≤ 1.0

Mn ≤ 2.00

P ≤ 0.045

S ≤ 0.030

Ni: 10.0-14.0

Cr: 16.0-18.0

Mo: 2.0-3.0


Melting Point: 1375~1450℃;

Solution Treatment: 1010~1150℃.

Using State

Annealed State of Solution

NO. 1, 2B, N0.4, HL and other surface states.

316L is a kind of stainless steel containing molybdenum, the total performance of the steel is better than 310 and 304 stainless steel, at high temperature, when the concentration of sulfuric acid is below 15% or higher than 85%, 316L stainless Steel has a wide range of uses. 316L Stainless steel also has a good resistance to chloride corrosion performance, so usually used in the marine environment.

316L Stainless Steel's maximum carbon content of 0.03, can be used for welding can not be annealed and the need for maximum corrosion resistance of the use.

Corrosion Resistance

Corrosion resistance is superior to 304 stainless steel, and has good corrosion resistance in pulp and paper production process. and 316L stainless steel is also resistant to the erosion of marine and erosive industrial atmospheres.

Heat Resistance

316L stainless steel has good oxidation resistance at 1600 degrees of intermittent use and continuous use below 700 degrees. In the 800-1575-degree range, it is best not to continue to function. 316L stainless steel, but the temperature range outside the continuous use of 316L stainless steel, the stainless steel with good heat resistance. 316L stainless steel resistance to carbide precipitation is better than 316 stainless steel, can be used above the temperature range. The solution is annealed in a temperature range of 1010-1150 degrees and then cooled rapidly. 316L stainless steel cannot be hardened for overheating treatment.

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.


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.



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