Range attributes Brinell Hardness 235 (maximum) C (Carbon) 0.28 to 0.48 % Cr (Chromium) 0.8 to 1.1 % Fe (Iron) 96.7 to 97.9 % (estimate) Mn (Manganese) 0.75 to 1 % Mo (Molybdenum) 0.15 to 0.25 % P (Phosphorus) 0.035 % (maximum) S (Sulfur) 0.04 % (maximum) Si (Silicon) 0.15 to 0.35 % Ultimate Tensile Strength 690 MPa (minimum) Yield Strength 550 MPa (minimum) Discrete attributes ~Checking Status Not verified - Original build Date Last Checked Thursday, October 17, 2013 Alloy Family Alloy Steel Alloy Group Chromium molybdenum steel Alloy Sub-Group 4130/ 4135/ 4137 Available forms Wrought Base Element Fe (Iron) Country USA Material Class Ferrous Alloy Source Worldwide Guide to Equivalent Irons and Steels, 5th ed. ASM International 2006 Specification Status Active Specification Type Standard Standards Body ASTM (USA) Short text attributes Composition Note_old Fe is listed as a Base element for this material, but its % value is not listed in the specification. The value shown is a calculated one. Country* USA Description_old Cr-Mo alloy bolting materials for pressure vessels for low-temp service; QT, <=65 mm. Designation L7M Specification ASTM A320/A320M Specification Status Notes active 2004 Long text attributes Composition Note Fe is listed as a Base element for this material, but its % value is not listed in the specification. The value shown is a calculated one. Description Cr-Mo alloy bolting materials for pressure vessels for low-temp service; QT, <=65 mm. Hyperlink attributes Similar Alloys Click here to find similar alloys Integer attributes Specification Year 2004 Further Information Organizations American Society for Testing and Materials (ASTM)
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Range attributes

Brinell Hardness

235

(maximum)