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HSLA Structural Steel Plate

Steel Plate Product:

HSLA steel plate is stronger & tougher than carbon steel, and is ductile, highly formable & weldable. This specification is intended primarily for use in structural members, where savings in weight (mass) and added durability are critical. 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 assures increased durability and offers a longer useful life span, making it a wise choice for street lighting poles, oil storage tanks and earth moving equipment.

A572 HSLA Structural Quality Steel

Gr42, Gr50, Gr55, Gr60, Gr65

A572 HSLA structural quality steel meets standard specifications for high-strength low-alloy columbium vanadium structural steel. The a572 specification covers five grades of HSLA structural steel plate; Gr42, Gr50, Gr55, Gr60 & Gr65. 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 – 42,000psi yield strength, 60,000psi tensile strength, 20% elongation in 8” test, and 24% in 2” test. Maximum thickness is 6”.
  • Grade 50 – 50,000psi yield strength, 65,000psi tensile strength, 18% elongation in 8” test, and 21% in 2” test. Maximum thickness is 4”.
  • Grade 55 – 55,000psi yield strength, 70,000psi tensile strength, 17% elongation in 8” test, and 20% in 2” test. Maximum thickness is 2”.
  • Grade 60 – 60,000psi yield strength, 75,000psi tensile strength, 16% elongation in 8” test, and 18% in 2” test. Maximum thickness is 1.25”.
  • Grade 65 – 65,000psi yield strength, 80,000psi tensile strength, 15% elongation in 8” test, and 17% in 2” test. Maximum thickness is 1.25”

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.

A656 HSLA Structural Quality Steel

50, 60, 70, 80 Strength Grades

A656 HSLA structural quality steel meets standard specifications for high-strength low-alloy, hot-rolled structural steel & features improved formability. This specification covers three types and four strength grades (50, 60, 70 & 80) 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:

GradeType 3 Type 7Type 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 .15 max .15 max
Nitrogen .020 max .020 max .020 max
Columbium .008 - .10 .10 max .10 max
Titanium .15 max

Mechanical Requirements:

  • Grade 50 – 50,000psi yield strength, 60,000psi tensile strength, 20% elongation in 8” test, 23% elongation in 2” test.  Maximum thickness is 2”.
  • Grade 60 – 60,000psi yield strength, 70,000psi tensile strength, 17% elongation in 8” test, 20% elongation in 2” test.  Maximum thickness is 1.50”.
  • Grade 70 – 70,000psi yield strength, 80,000psi tensile strength, 14% elongation in 8’ test, 17% elongation in 2” test.  Maximum thickness is 1”.
  • Grade 80 – 80,000psi yield strength, 90,000psi tensile strength, 12% elongation in 8” test, 15% elongation in 2” test.  Maximum thickness is .75”.

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