GB/T 8162 15CrMo Seamless Steel Pipes Material for Structural Purpose
GB/T 8162 15CrMo Seamless Steel Pipes for Structural Purpose: Chemical, Mechanical & Thermal Data
Comprehensive material data for 15CrMo seamless steel pipes according to GB/T 8162, including chemical composition, mechanical properties, physical properties, equivalent grades, and application guidance.
Hot rolling, cold drawing, normalizing, tempering, welding (with preheating and post-weld heat treatment)
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GB/T 8162 15CrMo Seamless Steel Pipes for Structural Purpose Introduction
15CrMo is a chromium-molybdenum low-alloy structural steel specified in GB/T 8162 for seamless steel pipes used in general structural applications. It offers a good combination of strength, toughness, and elevated-temperature performance due to the addition of Cr and Mo. Typical delivery condition is normalized or normalized and tempered. The steel is widely used for mechanical parts, pressure-containing components, and engineering structures where moderate heat resistance is required.
GB/T 8162 15CrMo Seamless Steel Pipes for Structural Purpose Chemical Composition
Heat analysis values according to GB/T 8162-2018 for 15CrMo. Elements shown are mandatory; the steel exhibits balanced Cr and Mo additions for improved high-temperature strength and oxidation resistance. Residual elements are controlled for weldability and toughness.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | 0.12 – 0.18 | |
| Silicon (Si) | 0.17 – 0.37 | |
| Manganese (Mn) | 0.40 – 0.70 | |
| Phosphorus (P) | ≤ 0.030 | |
| Sulfur (S) | ≤ 0.030 | |
| Chromium (Cr) | 0.80 – 1.10 | |
| Molybdenum (Mo) | 0.40 – 0.55 | |
| Nickel (Ni) | ≤ 0.30 | Residual element |
| Copper (Cu) | ≤ 0.20 | Residual element |
GB/T 8162 15CrMo Seamless Steel Pipes for Structural Purpose Thermal and Electrical Physical Properties
Typical values for 15CrMo in the normalized and tempered condition at room temperature unless otherwise stated. These properties are indicative and may vary slightly with actual processing parameters.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 210 | GPa | 20 °C |
| Shear Modulus (G) | 81 | GPa | 20 °C (estimated) |
| Poisson's Ratio (ν) | 0.30 | — | 20 °C (typical) |
| Thermal Expansion Coefficient (α) | 13.1 | 10⁻⁶/K | 20–100 °C |
| Thermal Expansion Coefficient (α) | 13.8 | 10⁻⁶/K | 20–200 °C |
| Thermal Expansion Coefficient (α) | 14.5 | 10⁻⁶/K | 20–300 °C |
| Thermal Conductivity (λ) | 44.0 | W/(m·K) | 20 °C |
| Thermal Conductivity (λ) | 41.5 | W/(m·K) | 200 °C |
| Thermal Conductivity (λ) | 38.5 | W/(m·K) | 300 °C |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρe) | 0.23 | µΩ·m | 20 °C (typical) |
GB/T 8162 15CrMo Seamless Steel Pipes for Structural Purpose Mechanical Properties
Longitudinal tensile properties at room temperature for seamless pipes according to GB/T 8162-2018. Values vary with wall thickness. Impact energy (KV2) is optional and tested only when specified. No bending test is mandatory for structural pipes unless agreed.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 295 | MPa | Wall thickness ≤ 16 mm, room temperature |
| Yield Strength (ReH) | ≥ 285 | MPa | Wall thickness 16–30 mm, room temperature |
| Yield Strength (ReH) | ≥ 275 | MPa | Wall thickness 30–50 mm, room temperature |
| Tensile Strength (Rm) | 440 – 640 | MPa | Room temperature |
| Elongation (A) | ≥ 22 | % | Longitudinal, gauge length 5.65√S0 |
| Elongation (A) | ≥ 20 | % | Transverse, when applicable |
| Impact Energy (KV2) | To be agreed upon | J | Test temperature as specified by agreement (often 20°C or -20°C) |
GB/T 8162 15CrMo Seamless Steel Pipes for Structural Purpose Completely Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 8162 | 15CrMo | Base standard, structural pipe |
| China | GB/T 8163 | 15CrMo | For fluid service, similar chemistry and properties |
| USA | ASTM A335/A335M | P12 | Seamless ferritic alloy-steel pipe for high-temperature service |
| USA | ASTM A213/A213M | T12 | Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes |
| Germany/Europe | DIN 17175 (withdrawn), EN 10216-2 | 13CrMo4-5 (1.7335) | Equivalent Cr-Mo composition, widely used for pressure purposes |
| Japan | JIS G3458 | STPA22 | Alloy steel pipes for high temperature service |
GB/T 8162 15CrMo Seamless Steel Pipes for Structural Purpose Application Introduction
15CrMo seamless pipes are used in a wide range of structural and mechanical engineering applications where moderate elevated-temperature strength and good weldability are required. Typical uses include parts in power generation, petrochemical, and construction industries.
Product Applications: Structural steel frameworks, Heat exchanger shells and components, Mechanical tubing for heavy equipment, Pressure-containing structural parts (with additional testing), Support hangers and brackets in high-temperature environments
Processed into products: Seamless pipes cut to length for structural columns, Machined flanges and connectors, Welded frames and sub-assemblies, Shafts and axles for heavy machinery, Boiler structural supports and headers (non-pressure boundary)
Application industries: Power generation (boiler supporting structures, steam/water piping supports), Petrochemical (process piping supports, structural frames), Construction and civil engineering (structural columns, trusses), Machinery manufacturing (hydraulic cylinders, rollers, shafts), Automotive (axle tubes, structural parts)
GB/T 8162 15CrMo Seamless Steel Pipes for Structural Purpose Similar/Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 8162 | 12CrMo | Lower Cr content (0.40–0.70%), lower strength but similar applications |
| China | GB/T 5310 | 15CrMoG | High-pressure boiler tube, same chemistry but stricter quality control |
| China | GB/T 8162 | 12Cr1MoV | Contains vanadium, higher creep strength, for higher temperatures |
| USA | ASTM A335 | P11 | 1.25Cr-0.5Mo, slightly higher Cr, often used as substitute depending on service conditions |
| Europe | EN 10216-2 | 16Mo3 (1.5415) | Mo-only alloy, lower high-temperature strength, cheaper alternative |
Notes:
- Welding: 15CrMo can be welded using low-hydrogen processes. Preheat to 200–250°C and post-weld heat treatment at 650–700°C are recommended to avoid cold cracking and maintain toughness.
- Corrosion resistance: It offers moderate oxidation resistance at elevated temperatures but is not suitable for severely corrosive environments without protective coatings.
- For pressure-bearing applications (e.g., boilers and pressure vessels), grades from GB/T 5310 or GB/T 8163 should be considered, which have stricter requirements on non-destructive testing.
- Impact testing is typically carried out only when specified in the purchase order, with agreed temperature and minimum energy values.
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