Designation System for Stainless Steel (ISO 3506 1979)
Composition Groups | Austenitic | Ferritic | Martensitic | |||||
---|---|---|---|---|---|---|---|---|
Identification of Steel Grades | A1, A2, A4 | F1 | C1, C4 | C3 | ||||
Property Class | 50 | 70 | 80 | 45 | 60 | 50 | 70 | 80 |
Soft | Cold-Worked | High-Strength | Soft | Cold-Worked | Soft | Hardened and Tempered | Hardened and Tempered |
Stainless Steel Properties
Extract from DIN 267 Part 11 - Chemical Composition of austenitic chromium-nickels steels in % by weight
Austenitic Grade |
Material No. to AISI |
C | Si | Mn | P | S | Cr | Mo | Ni |
---|---|---|---|---|---|---|---|---|---|
A1 | 303 | 0.12 | 1.0 | 2.0 | 0.20 | 0.15 to 0.35 | 17.0 to 19.0 | 0.6 | 8.0 to 10.0 |
A2 | 304 | 0.08 | 1.0 | 2.0 | 0.05 | 0.03 | 17.0 to 20.0 | - | 8.0 to 13.0 |
A4 | 316 | 0.08 | 1.0 | 2.0 | 0.05 | 0.03 | 16.0 to 18.5 | 2.0 to 3.0 | 10.0 to 14.4 |
Mechanical Properties-Austenitic Grades
Bolts, Screws and Studs
Grade | Property Class | Tensile Strength Rm MPa (N/mm2) minimum | Yield Stress Rp 0.2 Mpa (N/mm2) minimum | Elongation AL Minimum | Proof Load Stress Sp Mpa (N/mm2) minimum | Diameter Range |
---|---|---|---|---|---|---|
A2 and A4 | 70 | 700 | 450 | 0.4d | 700 | =<M20 |
80 | 800 | 600 | 0.3d | 800 | =<M20 |
Comparison: US and ISO (DIN) Stainless Steels
Tensile Load
A2 and A4 as compared to 304 and 316 | Percent difference from US - Stainless Steel |
---|---|
up to M20 | 44% higher |
M22 and over | 6% lower |
Selection of Diameters - Tightening Torques, Loads
Guideline values for screws in steel groups A2-70 and A4-70 with standard metric threads to DIN 13
Diameter | Load 1) Force at 0.2% yield point N | Initial Stressing Force N | Tightening Torque Nm | Force in service N | ||
---|---|---|---|---|---|---|
Axial Static | Axial Dynamic | Radial Static or Dynamic | ||||
M3 | 2250 | 1420 | 0.9 | 610 | 360 | 120 |
M4 | 3960 | 2490 | 2.2 | 1070 | 640 | 210 |
M5 | 6390 | 4030 | 4.3 | 1730 | 1040 | 350 |
M6 | 9040 | 5700 | 7.3 | 2440 | 1470 | 490 |
M8 | 16470 | 10380 | 17.7 | 4450 | 2670 | 890 |
M10 | 26100 | 16440 | 35.5 | 7050 | 4230 | 1410 |
M12 | 37930 | 23900 | 61.3 | 10240 | 6150 | 2050 |
M16 | 70650 | 44510 | 147.1 | 19080 | 11450 | 3820 |
M20 | 110250 | 69460 | 285.1 | 29770 | 17860 | 5950 |
1)The values correspond to 100% of the 0.2%
Notes on application:
**The table above is only intended as an aid for quick comparison**
Comparative International Stainless Steel Grades
British | French | German | Italian | Japanese | Swedish | USA |
---|---|---|---|---|---|---|
304S21 | Z12CN17.08 | 1.4310 | X12CrNi 17 07 | SUS301 | 14 23 31 | 301 |
304S31 | SUS302 | 14 23 32 | 302 | |||
304S15 304S16 |
Z8CN18.09 | 1.4301 | X5CrNi 18 10 | SUS301 | 14 23 33 | 304 |
304S11 | Z2CN18.10 | 1.4306 | X2CrNi 18 11 | SUS304L | 14 23 52 | 304L |
305S19 | Z8CN18.12 | X8CrNi 18 12 | SUS305 | 305 | ||
309S24 | Z15CN24.13 | X16CrNi 23 14 | SUS309 | 309 | ||
310S24 | Z12CN25.20 | 1.4845 | Z22CrNi 25 20 | SUS310S | 14 23 61 | 310 |
315S16 | 14 23 40 | |||||
316S31 316S33 |
Z6CND17.11 | 1.4401 1.4436 |
X8CrNiMo 17 13 | SUS316 | 14 23 43 14 23 47 |
316 |
316S11 316S13 |
Z2CND17.12 | 1.4404 1.4435 |
X2CrNiMo 17 12 | SUS316L | 14 23 53 14 23 48 |
316L |
317S12 | Z2CND19.15 | 1.4435 | X2CrNiMo 18 16 | SUS317L | 14 23 67 | 317L |
317S16 | 1.4436 | SUS317 | 14 23 66 | 317 | ||
320S31 320S33 |
Z8CND17.12 | 1.4571 1.4573 |
14 23 50 | |||
321S31 | Z6CNT18.12 | 1.4541 | X6CrNiTi 18 11 | SUS321 | 14 23 37 | 321 |
347S31 | Z6CNNb18.11 | 1.4558 | X6CrNiNb 18 11 X8CrNiNb 18 11 |
SUS347 | 14 23 38 | 347 |
403S17 | Z6C13 | 1.4000 | X6Cr13 | SUS403 | 14 23 01 | 403 |
405S17 | Z6CA13 | 1.4002 | Z6CrA1 13 | SUS405 | 405 | |
409S19 | 1.4512 | 409 | ||||
430S17 | Z8C17 | 1.4016 | X8Cr 17 | SUS430 | 14 23 20 | 430 |
434S17 | Z8CD17.01 | 1.4113 | X8CrMo 17 | SUS434 | 14 23 25 | 434 |
410S21 | Z12C13 | 1.4006 1.4024 |
X12Cr 13 | SUS410 | 13 23 02 | 410 |
410S45 | Z30C13 | X30Cr 13 | SUS420JS | 14 23 04 | 420 |