JIS G4305 SUS201 Stainless Steel Pipe
JIS G4305 SUS201 Stainless Steel Pipe: Properties, Composition & Applications
Comprehensive analysis of JIS G4305 SUS201 stainless steel pipe material data including chemical composition, mechanical properties, physical characteristics, equivalent standards, and application guidance.
Cold rolling, hot rolling, welding, bending, drawing, stamping, machining
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JIS G4305 SUS201 Stainless Steel Pipe Introduction
SUS201 is a chromium-nickel-manganese austenitic stainless steel defined in the Japanese Industrial Standard JIS G4305 for cold-rolled plates, sheets and strips, and widely used for piping applications. This grade is specifically designed as a cost-effective alternative to the more common SUS304 by partially substituting nickel with higher concentrations of manganese and nitrogen, preserving the austenitic structure while reducing raw material costs.
Key advantages include:
- Good formability and weldability suitable for a range of fabrication processes
- Moderate corrosion resistance in mildly aggressive environments
- Excellent mechanical properties with tensile strength exceeding 520 MPa
- Attractive surface finish after cold working
SUS201 stainless steel pipe is typically produced to complementary standards such as JIS G3459, using the same chemical composition. The material exhibits stable austenite at ambient temperatures, though increased manganese content may cause slight magnetism after severe cold deformation. Its low nickel content makes it particularly attractive where material cost is a primary consideration without sacrificing essential performance in non-critical applications. Typical delivery condition for pipe is solution-annealed and pickled, ensuring a clean, passive surface ready for installation.
JIS G4305 SUS201 Stainless Steel Pipe Chemical Composition
The chemical composition of SUS201 under JIS G4305 features a low nickel content compensated by higher manganese and nitrogen to stabilize the austenitic phase. This formulation yields a cost-efficient grade with properties comparable to SUS304 in mild environments. No molybdenum is intentionally added, distinguishing it from some other 200-series grades.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | ≤ 0.15 | Maximum |
| Si | ≤ 1.00 | Maximum |
| Mn | 5.50 - 7.50 | Range |
| P | ≤ 0.060 | Maximum |
| S | ≤ 0.030 | Maximum |
| Ni | 3.50 - 5.50 | Range |
| Cr | 16.00 - 18.00 | Range |
| N | ≤ 0.25 | Maximum |
JIS G4305 SUS201 Stainless Steel Pipe Thermal and Electrical Physical Properties
Physical properties of SUS201 stainless steel at room temperature unless otherwise noted. These values are typical for annealed material and may exhibit minor variations depending on specific production conditions and measurement methods. Thermal and electrical data are essential for design in environments with temperature fluctuations or electrical conductivity requirements.
| Property | Typical Value | Unit | Condition/Test Method |
|---|---|---|---|
| Density (ρ) | 7.8 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 197 | GPa | Room temperature, tensile |
| Shear Modulus (G) | 86 | GPa | Room temperature, calculated |
| Poisson's Ratio (ν) | 0.3 | dimensionless | Room temperature |
| Thermal Expansion Coefficient (α) | 16.6 | ×10⁻⁶/K | 20–100°C |
| Thermal Conductivity (λ) | 16.2 | W/(m·K) | At 100°C |
| Specific Heat Capacity | 500 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρe) | 0.73 | μΩ·m | At 20°C |
JIS G4305 SUS201 Stainless Steel Pipe Mechanical Properties
Mechanical properties for cold-rolled SUS201 sheet in solution-annealed condition as specified in JIS G4305. For pipe applications, properties may vary according to product standard (e.g., JIS G3459), where yield strength is often specified at a minimum of 205 MPa. The table below reflects JIS G4305 requirements for sheet products, which are indicative of the material capability. Bend test requirement applies to ensure formability.
| Property | Standard Requirement | Unit | Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 520 | MPa | Solution-annealed, cold-rolled |
| Yield Strength (Rp0.2) | ≥ 275 | MPa | Solution-annealed, cold-rolled |
| Elongation (A) | ≥ 55 | % | Thickness ≤3 mm, gauge length 50 mm |
| Elongation (A) | ≥ 45 | % | 3 mm < Thickness ≤6 mm, gauge length 50 mm |
| Hardness | ≤ 200 | HV | Solution-annealed |
| Hardness | ≤ 90 | HRB | Solution-annealed |
| Bending Test (180°) | No cracking | - | Bend diameter = 1t, thickness ≤3 mm |
JIS G4305 SUS201 Stainless Steel Pipe Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4305 | SUS201 | Original specification; also covered by JIS G3459 for pipes |
| USA | ASTM A240 / A666 | 201 (UNS S20100) | Chemical composition and property requirements closely aligned |
| EU | EN 10088-2 | 1.4372 (X12CrMnNiN17-7-5) | Minor differences in Mn and N ranges, but functionally equivalent |
| China | GB/T 20878 / GB/T 24511 | 12Cr17Mn6Ni5N | Domestic grade matching SUS201 composition and performance |
JIS G4305 SUS201 Stainless Steel Pipe Application Introduction
SUS201 is ideally suited for cost-sensitive applications where moderate corrosion resistance is sufficient. Its excellent formability and weldability allow for diverse product designs. Common uses span kitchenware, automotive trim, architectural elements, and industrial piping. It is not recommended for highly corrosive environments such as marine exposure, chemical processing involving chlorides, or prolonged high-temperature service due to potential sensitization.
Product Applications: Kitchen sinks and countertops, Dishwasher and washing machine interiors, Vehicle body panels and trim, Architectural facade panels, Light-gauge piping systems, Handrails and guardrails
Processed into products: Welded pipe sections and flanges, Valve bodies and fittings, Stamped decorative panels, Fasteners and brackets, Exhaust system components (mild environments), Drawn or spun kitchenware components
Application industries: Architecture and Construction, Automotive, Home Appliances, Food Processing, General Engineering
JIS G4305 SUS201 Stainless Steel Pipe Similar/Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4305 | SUS304 | Higher Ni (8-11%), superior corrosion resistance; commonly replaced by SUS201 in lower-cost applications |
| USA | ASTM A240 | 304 (UNS S30400) | Better pitting and general corrosion resistance; more expensive |
| EU | EN 10088-2 | 1.4373 (X12CrMnNi18-9-5) | Another low-nickel grade with similar Mn/Cr balance, moderately improved formability |
| China | GB/T 20878 | 12Cr18Ni9 (SUS304 equivalent) | Higher nickel content, recommended for more aggressive environments |
Notes:
Corrosion resistance: SUS201 exhibits lower resistance to pitting and crevice corrosion compared to SUS304, especially in chloride-containing environments. It is not recommended for marine, chemical plant, or coastal applications.
Magnetic properties: In the annealed condition it is non-magnetic, but cold working can induce a small degree of magnetism due to the formation of martensite.
Welding: Standard welding processes (TIG, MIG, resistance) are applicable; post-weld annealing is often not required for thin sections, but attention should be paid to sensitization in thick sections or service above 450°C.
Standards for pipe: While chemical composition complies with JIS G4305, corresponding pipe standards (e.g., JIS G3459, ASTM A213 for TP201) should be consulted for dimensional and pressure ratings.
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