Common Designations for cold heading

Type Of Steel/Alloy Grade Steel Number Steel Designation UNS Trade Name
General purpose austenitic A2 1.4301 X5CrNi18-10 S30400 304

A2 Stainless Steel Bolts Properties

A2 Stainless Steel Bolts Chemical Requirements

Stainless steel grade Chemical composition a (cast analysis, mass fractionin %) b Other elements and notes
C Si Mn P S Cr Mo Ni Cu N
Austenitic A2 0,10 1,00 2,00 0,050 0,030 15,0 to 20,0 _ f 8,0 to 19,0 4,0 - g,h

A2 Stainless Steel Bolts Mechanical Requirements

Stainless steel grade Property class Tensile strength a Rmf min. MPa Stress at 0,2 % non-proportional elongation b Rpf mm. MPa Elongation after fracture A min. mm
Austenitic A2 50 500 210 0,6d
70 700 450 0,4d
80 800 600 0,3d

Applicability of tests for fasteners with full loadability

Stainless steel grade Property and related test method
Minimum tensile strength Rmr Stress at 0,2 % non-proportional elongation Rpf Elongation after fracture A Minimum breaking torque M B Hardness
Tensile test 9.1 Wedge tensile test 9.4 Tensile test 9.1 Tensile test 9.1 Torsional test 9.5 Hardness test 9.6
A2 d ≥ 3 mm I ≥ 2,Sd b ≥ 2d Not relevant d ≥ 3 mm I ≥ 2,Sd b ≥ 2d d ≥ 3 mm I ≥ 2,Sd b ≥ 2 d For all lengths when d < 3 mm; only for lengths I < 2,Sd when d ≥ 3 mm b ≥ ld + 2 P No value available for property class 100 or for fine pitch thread Not applicable

Applicability of tests for fasteners with reduced loadability

Stainless steel grade Property and related test method
Minimum tensile strength Rmr Stress at 0,2 % non-proportional elongation Rpf Elongation after fracture A Minimum tensile load Fmr Hardness
Tensile test 9.1, 9.3 Tensile test 9.1 Tensile test 9.1 Tensile test 9.2 Hardness test 9.6
A2 d ≥ 3 mm for all lengths, when b ≥ 3d a d ≥ 3 mm for all lengths Not applicable