GB/T 21832.2 S22253 Welded Ferritie Duplex Stainless Steel Tubes And Pipes For Fluid Transport
GB/T 21832.2: Welded Ferritic Duplex Stainless Steel Tubes and Pipes for Fluid Transport
Introduction
GB/T 21832.2 is a Chinese national standard that specifies the requirements for welded ferritic duplex stainless steel tubes and pipes used for fluid transport. This standard covers various materials, specifications, chemical compositions, mechanical properties, and applications of these stainless steel tubes and pipes.
Material
The material used in accordance with GB/T 21832.2 includes the following grades:
- S21953
- S22253
- S22053
- S23043
- S22553
These grades are specifically designed to exhibit excellent corrosion resistance, high strength, and good weldability, making them suitable for various fluid transport applications.
Specification
GB/T 21832.2 provides detailed specifications for the dimensions, tolerances, and technical requirements of welded ferritic duplex stainless steel tubes and pipes. These specifications ensure the proper functioning and durability of the tubes and pipes in fluid transport systems.
Chemical Composition
The chemical composition of the ferritic duplex stainless steel grades mentioned in GB/T 21832.2 is as follows:
| Grade | C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| S21953 | 0.03 | 1.00 | 2.00 | 0.035 | 0.015 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 |
| S22253 | 0.03 | 1.00 | 2.00 | 0.035 | 0.015 | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 |
| S22053 | 0.03 | 1.00 | 2.00 | 0.035 | 0.015 | 21.5-24.0 | 5.5-7.5 | 2.5-3.5 | 0.10-0.22 |
| S23043 | 0.03 | 1.00 | 2.00 | 0.035 | 0.015 | 22.0-24.0 | 3.0-5.5 | 0.10-0.60 | 0.10-0.30 |
| S22553 | 0.03 | 1.00 | 2.00 | 0.035 | 0.015 | 24.0-26.0 | 4.5-6.5 | 2.9-3.9 | 0.10-0.25 |
Mechanical Properties
The mechanical properties of the ferritic duplex stainless steel grades specified in GB/T 21832.2 are as follows:
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| S21953 | ≥620 | ≥450 | ≥25 | ≤290 |
| S22253 | ≥620 | ≥450 | ≥25 | ≤290 |
| S22053 | ≥620 | ≥450 | ≥25 | ≤290 |
| S23043 | ≥620 | ≥450 | ≥25 | ≤290 |
| S22553 | ≥620 | ≥450 | ≥25 | ≤290 |
Application
The welded ferritic duplex stainless steel tubes and pipes specified in GB/T 21832.2 find extensive application in various fluid transport systems. These systems include but are not limited to:
- Oil and gas pipelines
- Chemical processing plants
- Desalination plants
- Heat exchangers
- Water treatment facilities
The excellent corrosion resistance, high strength, and good weldability of these stainless steel tubes and pipes make them ideal for handling corrosive fluids and operating in demanding environments.
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