A572 Gr.55 vs A572 Gr.60
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
A572 Gr.55
Structural & HSLA Steel
ASTM A572 Grade 55 is a columbium-vanadium HSLA structural steel one step above the ubiquitous Gr.50: yield rises to ≥380 MPa (55 ksi) and tensile to ≥485 MPa (70 ksi) while chemistry stays lean and weldable. It is used where Gr.50 sections become too heavy but Gr.65 hardenability is not wanted.
Standards: DIN S355J2 (near) · AISI A572 Gr.55 · JIS SM490B (near) · GB Q355B (near)
A572 Gr.60
Structural & HSLA Steel
ASTM A572 Grade 60 is the 60 ksi member of the standard American HSLA structural family. It slots between Gr.50 and Gr.65 for columns and heavy sections where A572-50 designs get bulky but a full 65 ksi design is unnecessary.
Standards: DIN S420 class (near) · AISI A572 Gr.60 · JIS SM570 (near) · GB Q420 class (near)
Chemical composition compared (%)
| Element | A572 Gr.55 | A572 Gr.60 |
|---|---|---|
| C | ≤0.25 | ≤0.26 |
| Si | ≤0.40 | ≤0.40 |
| Mn | ≤1.35 | ≤1.35 |
| P | ≤0.04 | ≤0.035 |
| S | ≤0.05 | ≤0.045 |
| Note | Strength comes from a Nb, V or Nb-V addition — Type 1, 2, 3 or 5 must be specified on the order | Nb/V microalloy type per ASTM A572 |
Properties compared
| Property | A572 Gr.55 | A572 Gr.60 |
|---|---|---|
| Yield strength | ≥380 MPa | ≥415 MPa (60 ksi) |
| Tensile strength | ≥485 MPa | ≥520 MPa (75 ksi) |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: A572 Gr.55 · A572 Gr.60. Substitution decisions for certified parts stay with the design authority.