JIS G 4053 SNCM 439 Seamless Steel Pipe,JIS G 4053 SNCM 439 Seamless steel pipe is a kind of alloy steel pipe with excellent performance.
Standards and equivalent materials:
Standard: Conforms to Japanese Industrial Standard JIS G 4053.
Equivalent materials: 40CrNiMoA, 4340, 817M40, 816M40, etc.
chemical composition of JIS G 4053 SNCM 439 seamless steel pipe
| Element | Content Range (%) |
|---|---|
| Carbon (C) | 0.36–0.43 |
| Silicon (Si) | 0.15–0.35 |
| Manganese (Mn) | 0.60–0.90 |
| Phosphorus (P) | ≤0.03 |
| Sulfur (S) | ≤0.03 |
| Nickel (Ni) | 1.60–2.00 |
| Chromium (Cr) | 0.60–1.00 |
| Molybdenum (Mo) | 0.15–0.30 |
the mechanical properties of JIS G 4053 SNCM 439 seamless steel pipe
| Property/Category | Value/Parameter | Unit | Description |
|---|---|---|---|
| Tensile Strength | ≥980 | MPa | High resistance to tensile forces, suitable for heavy-load applications. |
| Elongation | ≥12 | % | Good ductility; allows plastic deformation before fracture. |
| Impact Work (αkv) | ≥78 | J/cm² | High toughness; resists impact loads and reduces brittle fracture risk. |
| Hardness | ≤269 | HB | Balanced wear resistance and machinability; adjustable via heat treatment. |
| Heat Treatment (Quenching) | 850°C, oil-cooled | - | Increases hardness and strength by forming martensite. |
| Heat Treatment (Tempering) | 600°C, water/oil-cooled | - | Relieves quenching stress, improves toughness and plasticity. |
| Delivery Status | Heat-treated (normalizing, annealing, high-temperature tempering) or as-HT | - | Specific status to be confirmed in contracts; ensures mechanical property consistency. |
Notes:
Mechanical properties are typical values after quenching and tempering.
Heat treatment parameters may vary slightly based on pipe diameter, wall thickness, and customer requirements.
The delivery status should be clarified in technical specifications to meet application-specific needs (e.g., machinability vs. structural strength).
Characteristics and applications:
Features: high strength, high toughness, good hardenability and heat resistance, good wear resistance, can withstand large loads, and is suitable for the manufacture of large, heavy-duty and high-strength parts.
Application: Widely used in aviation, automotive, machinery manufacturing and other industries, commonly used in the manufacture of high-strength and high-toughness mechanical parts, such as screws, gears, shafts, nuts, pistons, as well as automobiles and motorcycles and other key components of transportation, but also suitable for the manufacture of alloy structural components that require extremely high strength and toughness.
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