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ASTM A105 is a commonly used standard for carbon steel, primarily used to manufacture pipe fittings such as flanges, valves, joints, elbows, and other components that withstand pressure and temperature.
Its applications are widespread, especially in industries such as oil, natural gas, chemicals, and power. Its excellent mechanical properties and versatility make it an ideal choice for medium-pressure and temperature environments.
Now, let’s explore the equivalent materials to ASTM A105 in various national standards to assist with your purchasing and usage decisions.
Equivalent Materials to ASTM A105 in Different Regions and Countries
| Region/Country | Standard | Equivalent Material |
| Europe | EN 10213 | GS-C25 (Forged Carbon Steel for Pressure Parts) |
| EN 10025 | S235JR (Carbon Structural Steel, commonly used for pressure equipment) | |
| Japan | JIS G3454 | STPG370 (For Pressure Piping) |
| JIS G3101 | SS400 (General Structural Carbon Steel) | |
| Germany | DIN 17175 | St 35.8 (Carbon Steel Pipe, for Pressure Systems) |
| DIN 17200 | C 22.8 (General Carbon Steel) | |
| United Kingdom | BS 1501 | 1501-151 Grade 360 (Carbon Steel for Pressure Equipment) |
| China | GB 713 | Q245R (Boiler Carbon Steel) |
| GB 699 | Q235B (Structural Carbon Steel, commonly used for Pressure Vessels) | |
| International | ISO 6505 | P245GH (Forged Steel for Pressure Parts) |
| ISO 4957 | 42CrMo4 (Alloy Steel with High Strength) | |
| India | IS 2062 | E250 (Common Carbon Steel for Structural and Pressure Systems) |
| South Korea | KS D 3503 | STPT370 (Carbon Steel for Pressure Piping) |
| United States | ASTM A105N | A105N (Normalized Version of ASTM A105) |
Elemental Composition of ASTM A105 and Its Equivalent Materials
| Materials | C (%) | Mn (%) | P (%) | S (%) | Si (%) | Cr (%) | Ni (%) | Mo (%) | Cu (%) | V (%) |
| ASTM A105 | 0.35 max | 0.60–1.05 | 0.035 max | 0.035 max | 0.10–0.60 | 0.30 max | 0.40 max | — | — | — |
| GS-C25 (EN 10213) | 0.20–0.25 | 0.90–1.20 | 0.035 max | 0.035 max | 0.40–0.60 | 0.30 max | 0.40 max | — | — | — |
| S235JR (EN 10025) | 0.17–0.20 | 1.40–1.70 | 0.035 max | 0.035 max | 0.35 max | 0.30 max | 0.30 max | — | — | — |
| STPG370 (JIS G3454) | 0.20–0.25 | 0.90–1.40 | 0.035 max | 0.035 max | 0.15–0.35 | 0.30 max | 0.40 max | — | — | — |
| SS400 (JIS G3101) | 0.15–0.25 | 0.60–0.90 | 0.035 max | 0.035 max | 0.15–0.35 | 0.30 max | 0.30 max | — | — | — |
| St 35.8 (DIN 17175) | 0.17–0.22 | 0.40–0.70 | 0.035 max | 0.035 max | 0.10–0.35 | 0.30 max | 0.40 max | — | — | — |
| C 22.8 (DIN 17200) | 0.20–0.30 | 0.60–0.90 | 0.035 max | 0.035 max | 0.10–0.35 | 0.30 max | 0.30 max | — | — | — |
| 1501-151 Grade 360 (BS 1501) | 0.24–0.30 | 0.60–0.90 | 0.035 max | 0.035 max | 0.15–0.35 | 0.30 max | 0.30 max | — | — | — |
| Q245R (GB 713) | 0.20–0.25 | 0.90–1.20 | 0.035 max | 0.035 max | 0.40–0.60 | 0.30 max | 0.40 max | — | — | — |
| Q235B (GB 699) | 0.14–0.22 | 0.30–0.70 | 0.035 max | 0.035 max | 0.15–0.35 | 0.30 max | 0.30 max | — | — | — |
| P245GH (ISO 6505) | 0.20–0.25 | 0.90–1.20 | 0.035 max | 0.035 max | 0.40–0.60 | 0.30 max | 0.40 max | — | — | — |
| 42CrMo4 (ISO 4957) | 0.38–0.45 | 0.60–0.90 | 0.035 max | 0.035 max | 0.10–0.35 | 0.90–1.20 | 0.25 max | 0.20–0.30 | 0.25 max | 0.03 max |
| E250 (IS 2062) | 0.23–0.30 | 0.60–0.90 | 0.035 max | 0.035 max | 0.15–0.35 | 0.30 max | 0.30 max | — | — | — |
| STPT370 (KS D 3503) | 0.20–0.25 | 0.90–1.40 | 0.035 max | 0.035 max | 0.15–0.35 | 0.30 max | 0.40 max | — | — | — |
Mechanical Properties
| Region/Country | Standard | Equivalent Material | Tensile Strength | Yield Strength | Elongation | Hardness |
| Europe | EN 10213 | GS-C25 | 480–620 MPa | 250 MPa | 22% | HB 170 |
| EN 10025 | S235JR | 360–510 MPa | 235 MPa | 26% | HB 140 | |
| Japan | JIS G3454 | STPG370 | 370–510 MPa | 235 MPa | 20% | HRB 80 |
| JIS G3101 | SS400 | 400–510 MPa | 235 MPa | 26% | HB 140 | |
| Germany | DIN 17175 | St 35.8 | 490–630 MPa | 250 MPa | 20% | HB 170 |
| DIN 17200 | C 22.8 | 410–550 MPa | 230 MPa | 23% | HB 160 | |
| United Kingdom | BS 1501 | 1501-151 Grade 360 | 480–620 MPa | 250 MPa | 22% | HB 170 |
| China | GB 713 | Q245R | 490 MPa | 245 MPa | 22% | HB 160 |
| GB 699 | Q235B | 375–500 MPa | 235 MPa | 26% | HB 140 | |
| International | ISO 6505 | P245GH | 410–540 MPa | 245 MPa | 24% | HB 150 |
| ISO 4957 | 42CrMo4 | 850–1000 MPa | 600 MPa | 12% | HB 250 | |
| India | IS 2062 | E250 | 410–530 MPa | 250 MPa | 23% | HB 160 |
| South Korea | KS D 3503 | STPT370 | 370–510 MPa | 235 MPa | 20% | HRB 80 |
| United States | ASTM A105N | A105N | 485 MPa | 250 MPa | 20% | HB 160 |
Physical Properties
| Property | Value |
| Density | 7.85 g/cm³ (7850 kg/m³) |
| Melting Point | 1425–1540 °C |
| Thermal Conductivity | 50.9 W/m·K |
| Electrical Conductivity | 10.0 × 10⁶ S/m |
| Specific Heat | 0.460 J/g·K |
| Young’s Modulus | 200 GPa (approx. 29 × 10⁶ psi) |
| Poisson’s Ratio | 0.29 |
| Coefficient of Expansion | 11.7 × 10⁻⁶/°C |
More resources：
ASTM A105 Carbon Steel Forgings
