300 Spring Series

300 Series Stainless Steel Spring Wire

ASTM A313

The most common grade for spring making is Type 302 Spring wire. Other grades commonly stocked are Type 304 and Type 316. Wire is most commonly used for spring making where corrosion resistance is of a high priority.

Available in bright, soap and nickel finishes

 

Chemical Requirments

ASTM A313

Standard Specification for Stainless Steel Spring Wire

Stainless Steel Austenitic Grades

UNS# Type C Mn P S Si Cr Ni Mo N
S30200 302 0.12 2.0 0.045 0.030 1.0 17.0-19.01 8.0-9.5 0.10
S30400 304 0.08 2.0 0.045 0.030 1.0 18.0-20.0 8.0-10.5 0.10
S31600 316 0.07 2.0 0.045 0.030 1.0 16.5-18.0 10.5-13.5 2.0-2.5 0.10

Stainless Steel Age-Hardenable Grades

uns# type c mn p s si cr ni other
S17700 631 0.09 1.0 0.040 0.030 1.0 16.0-18.0 6.5-7.8 AI 0.75-1.5

Tensile Requirements for Types 302 class I and 304

ASTM A313

Standard Specification for Stainless Steel Spring Wire

Diameter (inch) bend test
min number if bends
Tensile Strength
ksi min
tensile strength
ksi max
Up to 0.009, incl N/A 325 355
Over 0.009 to 0.010, incl N/A 320 350
Over 0.010 to 0.011, incl N/A 318 348
Over 0.011 to 0.012, incl N/A 316 346
Over 0.012 to 0.013, incl N/A 324 344
Over 0.013 to 0.014, incl N/A 312 342
Over 0.014 to 0.015, incl N/A 310 340
Over 0.015 to 0.016, incl N/A 308 338
Over 0.016 to 0.017, incl N/A 306 336
Over 0.017 to 0.018, incl N/A 304 334
Over 0.018 to 0.020, incl N/A 300 330
Over 0.020 to 0.022, incl N/A 296 326
Over 0.022 to 0.024, incl N/A 292 322
Over 0.024 to 0.026, incl 8 291 320
Over 0.026 to 0.028, incl 8 289 318
Over 0.028 to 0.031, incl 8 285 315
Over 0.031 to 0.034, incl 8 282 310
Over 0.034 to 0.037, incl 8 280 308
Over 0.037 to 0.041, incl 8 275 304
Over 0.041 to 0.045, incl 8 272 300
Over 0.045 to 0.050, incl 8 267 295
Over 0.050 to 0.054, incl 8 265 293
Over 0.054 to 0.058, incl 7 261 289
Over 0.058 to 0.063, incl 7 258 285
Over 0.063 to 0.070, incl 7 252 281
Over 0.070 to 0.075, incl 7 250 278
Over 0.075 to 0.080, incl 7 246 275
Over 0.080 to 0.087, incl 7 242 271
Over 0.087 to 0.095, incl 7 238 268
Over 0.095 to 0.105, incl 5 232 262
Over 0.105 to 0.115, incl 5 227 257
Over 0.115 to 0.125, incl 5 222 253
Over 0.125 to 0.135, incl 3 217 248
Over 0.135 to 0.148, incl 3 210 241
Over 0.148 to 0.162, incl 3 205 235
Over 0.162 to 0.177, incl 3 198 228
Over 0.177 to 0.192, incl 1 194 225
Over 0.192 to 0.207, incl 1 188 220
Over 0.207 to 0.225, incl 1 182 214
Over 0.225 to 0.250, incl 1 175 205
Over 0.250 to 0.278, incl 1 168 198
Over 0.278 to 0.306, incl 1 161 192
Over 0.306 to 0.331, incl 1 155 186
Over 0.331 to 0.362, incl 1 150 180
Over 0.362 to 0.394, incl 1 145 175
Over 0.394 to 0.438, incl 1 140 170
Over 0.438 to 0.500, incl 1 135 165
Over 0.500 130 160

When wire is specified in straightened and cut lengths, the minimum tensile strength shall be 90% of the value listed in table.

Tensile Requirements for Type 316

ASTM A313

Standard Specification for Stainless Steel Spring Wire

Diameter (Inch) Bend Test
Min number of bends
tensile strength
ksi min
tensile strength
ksi max
Up to 0.010, incl N/A 245 275
Over 0.010 to 0.015, incl N/A 240 270
Over 0.015 to 0.024, incl N/A 235 265
Over 0.024 to 0.041, incl 8 235 265
Over 0.041 to 0.047, incl 8 230 260
Over 0.047 to 0.054, incl 8 225 255
Over 0.054 to 0.062, incl 7 220 250
Over 0.062 to 0.072, incl 7 215 245
Over 0.072 to 0.080, incl 7 210 240
Over 0.080 to 0.092, incl 7 205 235
Over 0.092 to 0.105, incl 5 200 230
Over 0.105 to 0.120, incl 5 195 225
Over 0.120 to 0.148, incl 3 185 215
Over 0.148 to 0.166, incl 3 180 210
Over 0.166 to 0.177, incl 3 170 200
Over 0.177 to 0.207, incl 1 160 190
Over 0.207 to 0.225, incl 1 155 185
Over 0.225 to 0.250, incl 1 150 180
Over 0.250 to 0.312, incl 1 140 170
Over 0.312 to 0.375, incl 1 135 165
Over 0.375 to 0.500, incl 130 160
Over 0.500 125 155

When wire is specified in straightened and cut lengths, the minimum tensile strength shall be 90% of the value listed in table.

Tensile Requirements for Type 631, Condition CH – 900

ASTM A313

Standard Specification for Stainless Steel Spring Wire

Diameter (Inch) Cold Drawn
Condition C
KSI nominal
Tensile Strength
KSI Min
Tensile Strength
KSI Max
Over 0.010 to 0.015, incl 295 335 365
Over 0.015 to 0.020, incl 290 330 360
Over 0.020 to 0.029, incl 285 325 355
Over 0.029 to 0.041, incl 275 320 350
Over 0.041 to 0.051, incl 270 310 340
Over 0.051 to 0.061, incl 265 305 335
Over 0.061 to 0.071, incl 257 297 327
Over 0.071 to 0.086, incl 255 292 322
Over 0.086 to 0.090, incl 245 282 312
Over 0.090 to 0.100, incl 242 279 309
Over 0.100 to 0.106, incl 238 274 304
Over 0.106 to 0.130, incl 236 272 302
Over 0.130 to 0.138, incl 230 260 290
Over 0.138 to 0.146, incl 228 258 288
Over 0.146 to 0.162, incl 226 256 286
Over 0.162 to 0.180, incl 224 254 284
Over 0.180 to 0.207, incl 222 252 282
Over 0.207 to 0.225, incl 218 248 278
Over 0.225 to 0.306, incl 213 242 272
Over 0.306 to 0.440, incl 207 235 265
Over 0.440 to 0.625, incl 203 230 260

When wire is specified in straightened and cut lengths, the minimum tensile strength shall be 90% of the value listed in table.

Product Analysis Tolerances

ASTM A555

Standard Specification for General Requirements for Stainless Steel Wire and Wire Ro

Element Upper Limit or Maximum of Specified Range, % Tolerances over the maximum (upper limit) or
under the minimum (lower limit)
Carbon (C) To 0.010, incl
Over 0.010 to 0.030, incl
Over 0.030 to 0.20, incl
Over 0.20 to 0.60, incl
Over 0.60 to 1.20, incl
0.002
0.005
0.01
0.02
0.03
Manganese (Mn) To 1.00, incl
Over 1.00 to 3.00, incl
Over 3.00 to 6.00, incl
Over 6.00 to 10.00, incl
Over 10.00 to 15.00, incl
Over 15.00 to 20.00, incl
0.03
0.04
0.05
0.06
0.10
0.15
Phosphorus (P) To 0.040, incl
Over 0.040 to 0.20, incl
0.005
0.010
Sulfer (S) To 0.040, incl
Over 0.040 to 0.20, incl
Over 0.20 to 0.50, incl
0.005
0.010
0.020
Silicon (Si) To 1.00, incl
Over 1.00 to 3.00, incl
0.05
0.10
Chromium (Cr) Over 4.00 to 10.00, incl
Over 10.00 to 15.00, incl
Over 15.00 to 20.00, incl
Over 20.00 to 30.00, incl
0.10
0.15
0.20
0.25
Nickel (Ni) To 1.00, incl
Over 1.00 to 5.00, incl
Over 5.00 to 10.00, incl
Over 10.00 to 20.00, incl
Over 20.00 to 30.00, incl
Over 30.00 to 40.00, incl
Over 40.00
0.03
0.07
0.10
0.15
0.20
0.25
0.30
Molybdenum (Mo) Over 0.20 to 0.60, incl
Over 0.60 to 2.00, incl
Over 2.00 to 7.00, incl
Over 7.00 to 15.00, incl
Over 15.00 to 30.00, incl
0.30
0.50
0.10
0.15
0.20
Titanium (Ti) To 1.00, incl
Over 1.00 to 3.00, incl
Over 3.00
0.05
0.07
0.10
Cobalt (Co) Over 0.05 to 0.50, incl
Over 0.50 to 2.00, incl
Over 2.00 to 5.00, incl
Over 5.00 to 10.00, incl
Over 10.00 to 15.00, incl
Over 15.00 to 22.00, incl
Over 22.00 to 30.00, incl
0.01
0.02
0.05
0.10
0.15
0.20
0.25
Columbium (Cb)
+
Tantalum
To 1.50, incl
Over 1.50 to 5.00, incl
Over 5.00
0.05
0.10
0.15
Tantalum (Ta) To 0.10, incl 0.02
Copper (Cu) To 0.50, incl
Over 0.50 to 1.00, incl
Over 1.00 to 3.00, incl
Over 3.00 to 5.00, incl
Over 5.00 to 10.00, incl
0.03
0.05
0.10
0.15
0.20
Aluminum (Al) To 0.15, incl
Over 0.15 to 0.50, incl
Over 0.50 to 2.00, incl
Over 2.00 to 5.00, incl
Over 5.00 to 10.00, incl
-0.005
+0.01
0.05
0.10
0.20
0.35
Nitrogen (N) To 0.02, incl
Over 0.02 to 0.19, incl
Over 0.19 to 0.25, incl
Over 0.25 to 0.35, incl
Over 0.35 to 0.45, incl
0.005
0.01
0.02
0.03
0.04
Tungsten (W) To 1.00, incl
Over 1.00 to 2.00, incl
Over 2.00 to 5.00, incl
Over 5.00 to 10.00, incl
Over 10.00 to 20.00, incl
0.03
0.05
0.07
0.10
0.15
Vanadium (V) To 0.50, incl
Over 0.50 to 1.50, incl
0.03
0.05
Selenium (Se) all 0.03

Permissible Variations in Diameter and Out-of-Round for Round Wire

ASTM A555

Standard Specification for General Requirements for Stainless Steel Wire and Wire Rods

Specified Diameter (Inch) Over Under
1.00 and Over 0.0025 0.0025
Under 1.00 to 0.500 0.002 0.002
Under 0.500 to 0.3125, incl 0.0015 0.0015
Under 0.3125 to 0.0440, incl 0.001 0.001
Under 0.0440 to 0.0330, incl 0.0008 0.0008
Under 0.0330 to 0.0240, incl 0.0005 0.0005
Under 0.0240 to 0.0120, incl 0.0004 0.0004
Under 0.0120 to 0.0080, incl 0.0003 0.0003
Under 0.0080 to 0.0048, incl 0.0002 0.0002
Under 0.0048 to 0.0030, incl 0.0001 0.0001

 

Chemical Requirements (Composition, %)

ASTM A580

Standard Specification for Stainless Steel Wire

Stainless Steel Authentic Grades

UNS# Type C, max mn, max p, max s, max si, max cr ni mo n
S30200 302 0.15 2.00 0.045 0.030 1.00 17.0-19.0 8.0-10.0 0.10max
S30215 302B 0.15 2.00 0.045 0.030 2.00-3.00 17.0-19.0 8.0-10.0
S30400 304 0.08 2.00 0.045 0.030 1.00 18.0-20.0 8.0-10.5 0.10max
S30403 204L 0.030 2.00 0.045 0.030 1.00 18.0-20.0 8.0-12.0 0.10max
S31600 316 0.08 2.00 0.045 0.030 1.00 16.0-18.0 10.0-14.0 2.0-3.0 0.10max
S31603 316L 0.030 2.00 0.045 0.030 1.00 16.0-18.0 10.0-14.0 2.0-3.0 0.10max

Stainless Steel Ferritic Grades

UNS# Type C, max mn, max p, max s, max si, max cr ni mo n
S43000 430 0.12 1.00 o.040 0.030 1.00 16.0-18.0 0.10max

Maximum unless range is shown.

For some applications, the substitution of Type 304L for Type 304 or Type 316L for Type 316 may be undesirable because of design, fabrication or service requirements.

 

Mechanical Test Requirements

ASTM A580

Standard Specification for Stainless Steel Wire

Austenitic Grades

UNS# type condition Final Operation Tensile Strength, min. (KSI) Yield Strength, min. (KSI) Elongation in Length 4x Gage Diameter of
Test Specimens, min, %
Reduction of Area, min, %
S30200
S30215
S30400
S31600
302
302B
304
316
A Cold Finished 90 45 30 40
S30200
S30215
S30400
S31600
302
302B
304
316
A Annealed 75 30 35 50
S30403
S31603
304L
316L
A Cold Finished 90 45 30 40
S30403
S31603
04L 316L A Annealed 70 25 35 50

Ferritic Grades

UNS# type condition Final Operation Tensile Strength, min. (KSI) Yield Strength, min. (KSI) Elongation in Length 4x Gage Diameter of
Test Specimens, min, %
Reduction of Area, min, %
43000 430 A Cold Finished 70 40 16 45
43000 430 A Annealed 70 40 20 45

Minimum unless otherwise noted.