ASTM A242 specification is made for low alloy steel with high strength, it has good atmospheric corrosion resistance,ASTM A242 has 2 grades: Type 1 and Type 2, while type 1 is the most used structural steel grade.ASTM A242 covers high-strength low-alloy structural steel shapes, plates, and bars.ASTM A242/A242M Standard Specification for High-Strength Low-Alloy Structural Steel. Specification Grade : ASTM A242 Type 1 Standard : ASTM A242 / ASME SA242 Width : 1500mm to 4000mmLength : 3000mm to 12000mm Thickness : 6 to 200 mm Process : Hot-Rolled ASTM A242 TYPE 1 chemical composition ASTM A242A242 TYPE I C鈮?.15 Mn1.00 P0.15 S0.05 Si0.20 Cu0.25-0.55 ASTM A242 TYPE 1 tensile property GradeTensile StrengthMin. Yield PointElongation CORTEN A[470 鈥?630 MPa][355 MPa]20 % min ASTM 588 GR. A[485 MPa][345 MPa]21% min ASTM 242 TYPE -1[480 MPa][345 MPa]16% min IRSM 41- 97[480 MPa][340 MPa]21% min Gnee steel export ASTM A242 Type 1 Weather resistant steel all over the world. The A242 Type 1 steel plates are mainly used in steel structures and components, vehicles, mining equipment, machinery equipment, container, the pipelines.China ASTM CORTEN STEEL factory website:http://www.cortensteels.com/astm-corten-steel/