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ASTM A572 Grade 50 Steel
ASTM A572 grade 50 steel is a low-alloy high-strength structural steel with a yield strength of 50 ksi (345 MPa) and a tensile strength of 65 ksi (450 MPa). It has better mechanical properties than ASTM A36 steel. ASTM A572 contains 5 yield point grades: Grade 42, Grade 50, Grade 55, Grade 60 and Grade 65. Products cover structural steel shapes, plates, sheet piling, and bars. ASTM A572 GR 50 steel equivalent European standard is EN 10025-2 S355 steel.
ASTM A572 Grade 50 Properties & Specification
The following tables show ASTM A572 Grade 50 properties, as well as the specifications of Grade 65, Grade 60, etc. including chemical composition, mechanical properties and equivalent grade.
Chemical Composition
The following datasheet gives the chemical composition in based on heat analysis.
| Chemical Composition (Heat Analysis), % | |||||||||
| Standard | Grades | C, ≤ | Mn, ≤ | P, ≤ | S, ≤ | Si | Diameter, Thickness, or Distance Between Parallel Faces, (d) in (mm) Plates and Bars | Structural Shape Flange or Leg Thickness, in (mm) | |
| Plates ≤ 1.5 in (40mm) thick, Shapes with flange or leg thickness ≤ 3 in (75 mm), sheet piling, bars, zees, and rolled tees | Plates > 1.5 in (40 mm) thick and shapes with flange thickness > 3 in (75 mm) | ||||||||
| ASTM A572/A572M | Grade 42 [290] | 0.21 | 1.35 | 0.03 | 1.03 | 0.40 | 0.15-0.40 | 6 (150) | all |
| Grade 50 [345] | 0.23 | 1.35 | 4 (100) | all | |||||
| Grade 55 [380] | 0.25 | 1.35 | 2 (50) | all | |||||
| Grade 60 [415] | 0.26 | 1.35 | 1.25 (32) | ≤2 (50) | |||||
| Grade 65 [450] | 0.23 | 1.65 | 0.5< d≤1.25 (13-32) | 0.5< d≤2 (25-50) | |||||
| 0.26 | 1.35 | ≤0.5 (13) | ≤1 (25) | ||||||
| Alloy Content, Heat Analysis | ||||
| Standard | Type | Elements | Heat analysis, % | Product analysis, % |
| ASTM A572/A572M | 1 | Nb (Columbium) | 0.005-0.05 | 0.004-0.06 |
| 2 | V (Vanadium) | 0.01-0.15 | 0.005-0.17 | |
| 3 | Nb | 0.005-0.05 | 0.004-0.06 | |
| V | 0.01-0.15 | 0.005-0.17 | ||
| Nb+V | 0.02-0.15 | 0.01-0.16 | ||
| 5 | Ti (Titanium) | 0.006-0.04 | ||
| N (Nitrogen) | 0.003-0.015 | |||
| V | 0.06, ≤ | |||
| Maximum Product Thickness or Size | ||||||
| Standard | Grades | Yield Point, ksi (MPa) ≥ | Thickness or Size, Plates and Bars, in (mm) ≤ | Structural Shape Flange or Leg Thickness, | Sheet Piling | Zees and Rolled Tees |
| ASTM A572/A572M | Grade 42 [290] | 42 (290) | 6 (150) | all | all | all |
| Grade 50 [345] | 50 (345) | 4 (100) | all | all | all | |
| Grade 55 [380] | 55 (380) | 2 (50) | all | all | all | |
| Grade 60 [415] | 60 (415) | 1.25 (32) | 2 (50) | all | all | |
| Grade 65 [450] | 65 (450) | 1.25 (32) | 2 (50) | not available | all | |
ASTM A572 Steel Mechanical Properties
The table below lists ASTM A572 Grade 50 mechanical properties such as modulus of elasticity (Young’s modulus), shear modulus, ultimate tensile strength, yield strength, Brinell hardness, etc.
| Mechanical Properties | |||||
| Standard | Grades | Yield Strength, ksi (MPa), ≥ | Tensile Strength, ksi (MPa), ≥ | Elongation, %, ≥ | |
| 8 in (200 mm) | 2 in (50 mm) | ||||
| ASTM A572/A572M | Grade 42 [290] | 42 (290) | 60 (415) | 20 | 24 |
| Grade 50 [345] | 50 (345) | 65 (450) | 18 | 21 | |
| Grade 55 [380] | 55 (380) | 70 (485) | 17 | 20 | |
| Grade 60 [415] | 60 (415) | 75 (520) | 16 | 18 | |
| Grade 65 [450] | 65 (450) | 80 (550) | 15 | 17 | |
Physical Properties
A572 GR 50 steel physical properties are given in the lists below:
| Physical Properties (A572 GR 50) | |
| Density, g/cm3 (lb/in3) | 7,83 (0.283) |
| Modulus of elasticity (Elastic Modulus), GPa (103 ksi) | 207 (30) |
| Shear Modulus, GPa (103 ksi) | 80 (11.6) |
| Bulk Modulus, GPa (103 ksi) | 160 (23.2) |
| Poisson’s Ratio | 0.3 |
A572 Material Applications
A572 material widely used in engineering structures, construction steel structures, construction machinery, mining and mountain machinery, trucks, bridges, pressure vessels, etc., especially for construction and engineering machinery components that require good weldability and toughness. For example, riveted or bolted structures or welded structures for bridges and other applications.
ASTM A572 Grade 50 Equivalent Material
ASTM A572 grade 50 equivalent to European EN standard (German DIN, British BSI, French NF…), ISO, Japanese JIS and Chinese GB standard. (For reference)
| ASTM A572 Equivalent Grade | |||||||||||||
| US | European Union | Germany | Japan | Chinese | Indian | ISO | |||||||
| Standard | Grades | Standard | Grade | Standard | Grade | Standard | Grade | Standard | Grade | Standard | Grade | Standard | Grade |
| ASTM A572/A572M | Grade 50 [345] | EN 10025-2; EN 10025:1993 | S355JR (1.0045) | DIN EN 10025-2; EN 10025:1993 DIN 17100 | S355JR (1.0045); St 52-3 | JIS G3135 | SPFC590 | GB/T 1591 | Q345, Q355 | IS 2062 | E350 | ISO 630-2 | S355 |
| Grade 42 [290] | S275 | St 44 | S275 | ||||||||||
| Grade 55 [380] | Q390 | ||||||||||||
| Grade 60 [415] | Q420 | E410 | |||||||||||
| Grade 65 [450] | S460 | Q460 | E450 | S450 | |||||||||
Related material: SS400 Steel, AISI 304 Stainless Steel, SS 304
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