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316L Stainless Steel Seamless Tubing
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316L Stainless Steel Seamless Tubing

Views: 239     Author: Kaylee     Publish Time: 2024-04-15      Origin: Site

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316L Stainless Steel Seamless Tubing

Product name

316L (00Cr17Ni14Mo2) stainless steel seamless pipe 316L is molybdenum based austenitic stainless steel, this stainless steel and conventional chrome-nickel austenite such as 304 stainless steel, has better resistance to general corrosion and spot corrosion, crevice corrosion.

316L has higher ductility, stress corrosion resistance, compressive strength and high temperature resistance. In addition to excellent corrosion resistance and strength, 316L also has good assembly and formability of austenitic stainless steel;

Product introduction

[1] Production specifications (mm) : 06×1~830×20(can be customized according to customer requirements)

[2] Length of finished product (m) : 5-7(can be customized according to customer requirements), some of the longest up to 28m

[3] Product material: 316L (00Cr17Ni14Mo2) [4] Theoretical weight (kg/m) : Cr-Ni austenitic stainless steel W= 0.2491s (D-S)

[5] Implementation standards

National standard: GB/T14975-2002 GB/T14976-2002 GB/T13296-2007

American standard: ASTM A312/A312M ASTM A269/269M ASTM A213A

German standard: DIN2462

JIS G3463

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2, hydraulic test:Carry out hydraulic pressure test on stainless steel seamless pipe one by one, and keep at least 5 seconds under the specified pressure value. The steel pipe shall not leak or leak, and the conventional supply water pressure pressure test is P=2SR/D(the maximum is not more than 20MPa).

3, corrosion resistance: In applications that require better resistance to general corrosion and spot corrosion, 317L is more popular than 316 or 316L, because 317L contains 3-4% molybdenum, and 316 and 316L contain only 2-3% aluminum.

4, process performance test: flattening test. Tensile test. Flaring test. Hardness test. Metallographic test. Non-destructive testing (including eddy current testing and ultrasonic testing);

Product use

Suitable for the manufacture of synthetic fiber, petrochemical, textile, fertilizer and dyeing and other industrial equipment for important corrosion resistant pipes. It has good intergranular corrosion resistance and good corrosion resistance to organic acids, alkalis and salts.

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Primary user

Boiler plant, heat exchanger plant, chemical plant, water treatment plant, etc

Matters needing attention

Regardless of the corrosion, the surface of stainless steel should be kept clean during processing and use. For light industry, less maintenance is required, and only sheltered areas sometimes need to be cleaned with pressurized water. Heavy industry recommends frequent cleaning to remove accumulated dust, which may eventually cause corrosion and damage the surface appearance of stainless steel. Stubborn stains and deposits can be scrubbed with detergent and fiber brush, sponge, stainless steel wool. Stainless steel lint can leave a permanent scratch on a smooth stainless steel surface. Many stainless steels are cleaned and disinfected regularly. Equipment is usually cleaned with special caustic soda, organic solvents, and acidic solutions (such as phosphoric acid or sulfuric acid). Strong reducing acids (such as hydrofluoric acid or hydrochloric acid) can cause damage to stainless steel. After solution cleaning, rinse stainless steel thoroughly with clean water.

Corrosion resistance

General corrosion, 316L has better corrosion resistance in atmospheric and other mild environments. However, for highly oxidizing acids (such as nitric acid), molybdenum containing stainless steel has weak corrosion resistance to this acid.

In general, under the same environmental conditions, the performance of 316L and 316 is comparable. However, in the environment that can cause welding and heat-affected zone intergranular corrosion, 316L with low carbon content is selected to improve intergranular corrosion resistance.

Stress corrosion

In halogenated environment, austenitic stainless steel is susceptible to stress corrosion cracking. Although 316L has good stress corrosion cracking resistance to a certain extent, it is still relatively easy to be affected.

Conditions for stress corrosion cracking include:

(1) The presence of halides (generally chloride)

(2) Residual tensile stress;

(3) The temperature exceeds 49°C. During the welding process, cold deformation or thermal cycling can produce stress. Annealing, stress relief Heat treatment can effectively reduce the stress, and therefore, reduce the sensitivity of 316L to halide stress corrosion cracking.

The increase of chromium and molybdenum content can improve the resistance of austenitic stainless steel to point corrosion/crevice corrosion in chloride or other halogen ion environments.

Point corrosion is calculated by PREN (pitting equivalent), PRE = Cr+ 3.3 Mo+ 16N.316L PREN=24.2,304 PREN=19.0, which reflects that 316L point corrosion resistance is better than 304.

Oxidation resistance 316L has good oxidation resistance, in the atmospheric environment, even if the temperature reaches 871 to 899° C, the rust production rate is relatively low.

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