What is S275M?
S275M is a thermo-mechanically rolled (TMCP), fine-grain structural steel defined in EN 10025-4.
It combines 275 MPa minimum yield strength with improved toughness, weldability, and excellent plate flatness, making it suitable for bridges, building structures, cranes, offshore support structures, and general engineering.
Meaning of the designation:
S = Structural steel
275 = Minimum yield strength (MPa)
M = Thermo-mechanically rolled
1. Chemical Composition (Typical Values, %)
| Element | C (max) | Si | Mn | P (max) | S (max) | Nb | V | Ti |
|---|---|---|---|---|---|---|---|---|
| S275M | 0.18 | ≤ 0.60 | 1.00–1.60 | 0.025 | 0.020 | ≤ 0.06 | ≤ 0.14 | ≤ 0.03 |
2. Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (≤16 mm) | 275 MPa |
| Yield Strength (40–100 mm) | 255–265 MPa |
| Tensile Strength | 370–510 MPa |
| Elongation (A5) | ≥ 22% |
| Charpy Impact (standard) | ≥ 27 J at –20°C |
| Density | 7.85 g/cm³ |
What is ASTM A572 Grade 42?
ASTM A572 Grade 42 is a high-strength, low-alloy (HSLA) structural steel defined in the ASTM A572 / A572M standard.
It combines 42 ksi (290 MPa) minimum yield strength, good weldability, and improved strength-to-weight ratio, making it widely used in bridges, buildings, construction equipment, and structural engineering.
1. Chemical Composition (Typical Values, %)
| Element | Typical Range | Notes |
|---|---|---|
| C | ≤ 0.21 | Low carbon for weldability |
| Mn | 0.60–1.50 | Strengthening element |
| P | ≤ 0.040 | Impurity limit |
| S | ≤ 0.050 | Impurity limit |
| Si | ≤ 0.40 | Improves strength |
| Cu | ≥ 0.20 (optional) | Enhanced corrosion resistance |
Actual values may vary by mill but remain within ASTM limits.
2. Mechanical Properties
| Property | Requirement |
|---|---|
| Yield Strength | 42 ksi (290 MPa) |
| Tensile Strength | 60 ksi (415 MPa) |
| Elongation (A5 or A8) | 18–21% |
| Density | 7.85 g/cm³ |
| Charpy Impact | Not always required; varies by project |
How does S275M compare to ASTM A572 Grade 42?
S275M is a thermo-mechanically rolled EN structural steel with 275 MPa yield strength and enhanced toughness.
A572 Grade 42 is an HSLA ASTM steel with 290 MPa yield strength designed mainly for U.S. structural applications.
1. Mechanical Properties Comparison
| Property | S275M (EN 10025-4) | A572 Grade 42 (ASTM A572) |
|---|---|---|
| Yield Strength | 275 MPa | 290 MPa |
| Tensile Strength | 370–510 MPa | 415 MPa |
| Elongation | ≥ 22% | 18–21% |
| Impact Toughness | 27 J @ –20°C (guaranteed) | Not always specified; depends on order |
| Rolling Condition | Thermo-mechanically rolled (M) | Standard HSLA |
2. Chemical Composition (General Comparison)
| Element | S275M | A572 Gr 42 |
|---|---|---|
| Carbon (C) | ≤ 0.18% | ≤ 0.21% |
| Manganese (Mn) | 1.0–1.6% | 0.60–1.50% |
| Phosphorus (P) | ≤ 0.025% | ≤ 0.040% |
| Sulfur (S) | ≤ 0.020% | ≤ 0.050% |
| Microalloying | Nb, V, Ti | Varies, less controlled |
GNEE Steel also supplies a variety of high-strength steel plates, such as A514 Grade F, A572 Grade 50, A588 Grade A, S355JR, S690Q, SS400, S690QL, Q345B, Q345E, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to info@gneesteels.com. You are welcome to consult us, and we are very willing to answer your questions.
