High Strength Low Alloy Structural Steel Plate
HSLA steel plate is stronger & tougher than carbon steel, and is ductile, highly formable & weldable. The material is highly resistant to corrosion, which is crucial in structural applications. This specification is intended primarily for use in structural members, where savings in weight ( mass) and added durability matter. Plate is used in truck frames, brackets, crane booms, rail cars and other comparable applications.
The increased strength of high strength low alloy structural steel means that structures can be built lighter, with less steel. This is important for car and truck construction as it improves fuel economy and is less damaging to road surfaces. In bridge design the center spans can be longer and will need fewer supporting beams. The extra strength of HSLA steel makes it more durable and offers a longer useful life span, making it a wise choice for street lighting poles, oil storage tanks and earth moving equipment.
HSLA Structural Quality
- 100,000 Minimum Yield TMCP
- A572 Gr50, 60, 65
- A572 Gr42
- A588
- A633
- A607 Gr50, 65
100,000 Minimum Yield TMCP
100,000 minimum yield plates are premium ultra-high strength, structural quality thermo-mechanical control processed. The typical applications for these plates include mining equipment, crane industry, truck trailers and construction equipment where superior flatness or exposed parts may be a factor. Each producing mill has its own proprietary chemical composition and heat treating process. Mill-specific specifications are available upon request.
- Chemical Requirements
- Mill specifications available upon request
- Mechanical Requirements
- Yield Strength - 100,000ksi minimum
- Tensile Strength - 110,000ksi minimum
- Mill specifications available upon request
A572
Standard specification for High-Strength Low-Alloy Columbium Vanadium Structural Steel. This specification covers five grades of high-strength low-alloy structural steel plates. Grades 42, 50, and 55 are intended for riveted, bolted, or welded structures. Grades 60 and 65 are intended for riveted or bolted construction of bridges, or for riveted, bolted or welded construction in other applications.
Chemical Requirements:
Carbon range is .21 to .26 depending on thickness
Manganese range is 1.35 to 1.65 depending on thickness
Phosphorous maximum is .04
Sulfur maximum is .05
Silicon can range from .15 to .40 depending on thickness
Mechanical Requirements:
Grade 42 – 42,000ksi yield strength, 60,000ksi tensile strength, 20% elongation in 8” test, and 24% in 2” test. Maximum thickness is 6”.
Grade 50 – 50,000ksi yield strength, 65,000ksi tensile strength, 18% elongation in 8” test, and 21% in 2” test. Maximum thickness is 4”.
Grade 55 – 55,000ksi yield strength, 70,000ksi tensile strength, 17% elongation in 8” test, and 20% in 2” test. Maximum thickness is 2”.
Grade 60 – 60,000ksi yield strength, 75,000ksi tensile strength, 16% elongation in 8” test, and 18% in 2” test. Maximum thickness is 1.25”.
Grade 65 – 65,000ksi yield strength, 80,000ksi tensile strength, 15% elongation in 8” test, and 17% in 2” test. Maximum thickness is 1.25”
Note – Mechanical requirements are minimums unless there is a range listed.
Alloy Content:
Type1 – Columbium range of .005 to .05.
Type 2 – Vanadium range of .01 to .15
Type 3 – Columbium range of .005 to .05, Vanadium range .01 to .15, Columbium plus Vanadium range .02 to .15.
Type 5 – Titanium range .006 to .04, Nitrogen range .003 to .015, Vanadium maximum .06.
A588
Standard Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi Minimum Yield Point, with Atmospheric Corrosion Resistance
This specification covers high-strength low-alloy structural steel plates for welded, riveted or bolted construction; intended primarily for use in welded bridges and buildings where savings in weight or added durability are important. The atmospheric corrosion resistance of this steel in most environments is substantially better that that of carbon structural steels with or without copper addition. When properly exposed to the atmosphere, this steel is suitable for many applications in the bare (unpainted) condition.
- Chemical Requirements:
| Grade | A | B | C | D |
| Carbon | .19 max | .20 max | .15 max | .17 max |
| Manganese | .80 - .125 | .75 - .135 | .80 -1.35 | .50 - 1.20 |
| Phosphorous | .04 max | .04 max | .04 max | .04 max |
| Sulfur | .05 max | .05 max | .05 max | .05 max |
| Silicon | .30 - .65 | .15 - .50 | .15 - .40 | .25 - .50 |
| Nickel | .40 max | .50 max | .25 - .50 | .40 max |
| Chromium | .40 - .65 | .40 - .70 | .30 - .50 | .40 - .70 |
| Molybdenum | .10 max | |||
| Copper | .25 - .40 | .20 - .40 | .20 - .50 | .30 - .50 |
| Vanadium | .02 - .10 | .01 - .10 | .01 - .10 | |
| Columbium | . | .005 - .05 |
- Mechanical Requirements:
| Thickness | Up to 4" | Over 4" to 5" | Over 4" to 5" |
| Yield Strength | 50,000ksi | 46,000ksi | 42,000ksi |
| Tensile Strength | 70,000ksi | 67,000ksi | 63,000ksi |
| Elongation in 2" test | 21% | 21% | 21% |
| Elongation in 8" test | 18% | ||
| Note - Mechanical requirements are minimums unless there is a range listed | |||
HSLA Structural Quality With Improved Formability
- A656 Gr80
- A715 Gr50
- 100 KSI as rolled
- 130 KSI as rolled
A656
Standard Specification for Hot-Rolled Structural Steel, High-Strength Low-Alloy Plate with Improved Formability. This specification covers three types and four strength grades of high-strength low-alloy, hot rolled structural steel plate for use in truck frames, brackets, crane booms, rail cars and similar applications. Steels that conform to this specification offer improved formability. These steels are normally furnished in the as-rolled condition.
Chemical Requirements:
| Grade | Type 3 | Type 7 | Type 8 |
| Carbon | .18 max | .18 max | .18 max |
| Manganese | 1.65 max | 1.65 max | 1.65 max |
| Phosphorous | .025 max | .025 max | .025 max |
| Sulfur | .035 max | .035 max | .035 max |
| Silicon | .60 max | .60 max | .60 max |
| Vanadium | .08 max | .08 max | .08 max |
| Nitrogen | .020 max | .020 max | .020 max |
| Columbium | .008 - .10 | .10 max. | .10 max. |
| Titanium | .15 max. | ||
| Note: Maximum thickness up to 1” incl. | |||
Mechanical Requirements:
Grade 50 – 50,000ksi yield strength, 60,000ksi tensile strength, 20% elongation in 8” test, 23% elongation in 2” test. Maximum thickness is 2”.
Grade 60 – 60,000ksi yield strength, 70,000ksi tensile strength, 17% elongation in 8” test, 20% elongation in 2” test. Maximum thickness is 1.50”.
Grade 70 – 70,000ksi yield strength, 80,000ksi tensile strength, 14% elongation in 8’ test, 17% elongation in 2” test. Maximum thickness is 1”.
Grade 80 – 80,000ksi yield strength, 90,000ksi tensile strength, 12% elongation in 8” test, 15% elongation in 2” test. Maximum thickness is .75”.
Note – Mechanical requirements are minimums unless there is a range listed.
Steels produced to this standard are hot-rolled carbon-based steels with small additions of alloy. The combination of carbon, low alloy, and killed steel fine grain melt provides increased strength, toughness, and improved strength-to-weight ratio over general-purpose, low-carbon grades–plus improved formability.
HSLA Structural Quality With Atmospheric Corrosion Resistance
- A656 Gr80
- A715 Gr50
Steels produced to this standard are hot-rolled carbon-based steels, which may have the addition of alloying elements, and are usually specified with 0.20 minimum copper. This combination of chemical elements provides a substantially increased strength-to-weight ratio, toughness, and improved resistance to atmospheric corrosion.
For more information on High-Strength Low-Alloy please contact a representative