ASTM A572 Grade 70 High-Strength Standard Specification
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ASTM A572 Grade 70 Plate steel plate is a high-strength, low-alloy steel that finds its best application where there is a need for more strength per unit of weight. Less of this material is needed to fulfill given strength requirements than is necessary with regular carbon steels. Grade 70 is used in general plate applications when the plate will be riveted, bolted, or welded.
Grade 70 is a Columbium-Vanadium steel that offers a minimum yield of 50,000 PSI. In addition, ASTM A572 Grade 70 is noted for its increased resistance to atmospheric corrosion. Grade 70 contains more alloying elements than plain carbon steel and thus is somewhat more difficult to form. Grade 70 is more difficult to cold work, but can be successfully bent or shaped but requires more force than plain carbon steel.
ASTM A573 is the Standard Specification for Structural Carbon Steel Plates with Improved Toughness for carbon-manganese-silicon plates up to 1.5 inches in thickness for service primarily at atmospheric temperatures when improved toughness is important. ASTM A573 Grade 70 has specified tensile strength range of 70-90 ksi.
Key Characteristics
High Strength: Offers superior strength for its weight compared to regular carbon steels, reducing material needs.
Alloying: Contains manganese, phosphorus, sulfur, silicon, and columbium-vanadium for enhanced mechanical properties.
Weldability: Good weldability, with specific consumables recommended for welding.
Corrosion Resistance: Better resistance to atmospheric corrosion than plain carbon steels.
Toughness: Good notch toughness for service at atmospheric temperatures.
Typical Applications
Bridges & Buildings: Structural components, beams, and supports.
Heavy Machinery: Parts requiring high load-bearing capacity.
Infrastructure: Transmission towers, truck parts, freight cars, and wind turbine components.
| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Density | 7.80 g/cc | 0.282 lb/in³ | Typical of ASTM Steel |
Mechanical Properties
|
Grade |
Yield strength |
Tensile strength |
Elongation in 2" 1) |
Elongation in 8" 1) |
|---|---|---|---|---|
|
ASTM A573 Grade 70 |
42 |
70 - 90 |
21 |
18 |
Chemical composition
| C(％) | 0.23 | Si(％) | 0.15～0.40 | Mn(％) | 1.35 | P(％) | 0.04 |
| S(％) | 0.05 | Ni(％) | 0.015 | Co (％) | 0.05 | V(％) | 0.06 |
1How is ASTM A572 Grade 70 Comparison to Other Grades?
Vs. A36: Stronger and more wear-resistant than ASTM A36, making it better for heavy-duty structural roles.
Vs. A572 Grades 42, 50, 55, 60, 65: A572 has several grades, with Grade 50 being most common, but Grade 70 provides even higher strength for critical applications,
2What is ASTM A572 Grade 70equivalent to ?
There isn't a direct single ASTM equivalent for A572 Grade 70, as A572 stops at Grade 65, but for similar high-strength, low-alloy (HSLA) properties (70 ksi yield), you'd look to other ASTM standards like A516 Grade 70 (pressure vessel), A529 Grade 55/60, or newer structural grades like A913 Grade 60/65/70, while European equivalents include S355J2/S355JR or P355GH, all offering comparable strength for different applications.
3What are the primary advantages of astm a572 grade 70 ?
The primary advantages of ASTM A572 Grade 70 steel are its high strength-to-weight ratio, making structures lighter yet robust, excellent weldability, good ductility, and enhanced atmospheric corrosion resistance compared to basic carbon steels, making it ideal for heavy structural uses like bridges, towers, and machinery where strength and efficiency are crucial.
4What is the yield strength of A572 Grade 70 steel?
50,000 PSI
Grade 70 is a Columbium-Vanadium steel that offers a minimum yield of 50,000 PSI. In addition, ASTM A572 Grade 70 is noted for its increased resistance to atmospheric corrosion.
5What are the typical application fields of astm a572 grade 70?
ASTM A572 Grade 70 (though A572 typically goes up to Grade 65, Grade 70 is often confused with A516 Gr 70 or A573 Gr 70, both used for toughness) is a high-strength, low-alloy (HSLA) steel used in heavy-duty structural applications needing strength and durability, like bridges, high-rise buildings, heavy machinery (cranes, bulldozers), transportation (railcars, trucks), power transmission towers, and offshore/marine structures, offering a good strength-to-weight ratio and weldability for demanding conditions.
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