Because of the many alloying material variations that can be used, High Strength Low Alloy steel is available in a wide range of grades. The chemical composition and grade of High Strength Low Alloy steel should be determined by the expected use.
ASTM A36 steel is a common form of HSLA steel. ASTM A36 is an HSLA steel that can be used for a variety of purposes. It is widely used in the construction of steel structures. It is inexpensive, weldable, and machinable. This adaptability, along with its outstanding mechanical properties is what makes it such a popular choice for structural uses.
Weathering steel is a form of HSLA steel as well. It is widely used in structural applications that do not need a coating or coats of paint, such as bridge construction. ASTM A242 and ASTM A588 are two standard weathering steel classes.
HSLA steel is used for more than just structural purposes. It is most commonly found in oil and gas delivery pipelines. Among the most popular materials being used in modern piping is API 5L Grade X70. The number “70” in the name refers to the 70,000 psi minimum yield strength needed by the American Petroleum Institute. ASTM A573 is another standard used in the oil and gas industry. ASTM A573 is a standard that is commonly used in the manufacturing of storage tanks.
Of course, there are a variety of other HSLA steel grades available. Such grades are designed to be weldable rather than machinable, and others are designed to be abrasion-resistant or precipitation resistant.

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