Extension Spring Materials

Material of spring wire for metric

Wire type	G [MPA]	Allowable limit torsion stress τ A	Density ρ [kg.m³]
Draw patented from carbon steel	80 500	0.5 σ_ult	7.85 10³
Heat treated from carbon steel	78 500	0.6 σ_ult
Heat treated or annealed from alloy steel (Si-Cr, Mn-Cr-V) 14260 and 15260	78 500	0.6 σ_ult
Hardened by drawing from chrome-nickel stainless austenitic steel 17242	68 500	0.5 σ_ult
Hardened by drawing from tin-bronze 423016 and 423018	41 500	0.45 σ_ult	8.8 10³
Hardened by drawing from brass 423210 and 423213	34 500	0.45 σ_ult	8.43 10³

Material of spring wire for English

Wire type	Modulus of Elasticity in Shear [psi]
Hard drawn steel wire QQ-W-428	11 200000
Music wire QQ-W-470	11 200000
Oil-tempered steel wire QQ-W-428	11 200000
Chrome-silicon alloy wire QQ-W-412	11 200000
Corrosion-resisting steel wire QQ-W-423	11 200000
Chrome-vanadium alloy steel wire	11 200000
Silicon-manganese steel wire	11 200000
Valve-spring quality wire	11 200000
Stainless steel 304 and 420	11 600000
Stainless steel 316	11 600000
Stainless steel 431 and 17-7 PH	11 600000

Allowable limit torsion stress τ A [10 3 psi]

Wire diameter [in]	Hard drawn steel wire QQ-W-428	Music wire QQ-W470	Oil-tempered steel wire QQ-W-428	Chrome-silicon alloy wire QQ-W-412	Corrosion-resisting steel wire QQ-W-423	Chrome-vanadium alloy steel wire	Silicon-manganese steel wire	Valve-spring quality wire	Stainless steel 304 and 420	Stainless steel 316	Stainless steel 431 and 17-7 PH
0.010	150	176	157	176	145	175	158	175	138	131	158
0.012	149	171	154	175	143	174	157	174	129	154	158
0.014	148	167	152	174	141	173	156	173	134	127	150
0.016	147	164	150	174	139	172	155	172	132	125	148
0.018	146	161	148	173	137	171	154	171	130	123	145
0.02	145	159	146	173	135	170	153	170	128	121	143
0.024	143	155	142	172	131	168	151	168	124	118	140
0.026	142	153	141	171	129	167	150	167	123	116	138
0.028	141	151	140	171	128	166	149	166	122	115	136
0.030	140	149	139	170	127	165	148	165	121	114	134
0.032	139	147	138	170	126	164	147	164	120	113	132
0.034	138	145	137	169	125	163	146	163	119	112	130
0.036	137	143	136	169	124	162	145	162	118	112	129
0.038	136	142	135	168	123	161	144	161	117	111	128
0.041	135	141	133	167	122	160	144	160	116	110	127
0.0475	132	138	130	166	119	156	140	156	113	107	124
0.054	138	136	128	165	117	152	137	152	111	105	122
0.0625	123	132	125	162	115	149	134	152	109	104	119