Stainless Steel Data

Designation System for Stainless Steel (ISO 3506 1979)

Composition GroupsAusteniticFerriticMartensitic
Identification of Steel GradesA1, A2, A4F1C1, C4C3
Property
Class
5070804560507080
SoftCold-
Worked
High-
Strength
SoftCold-WorkedSoftHardened
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
CSiMnPS CrMoNi
A13030.121.02.00.200.15 to 0.3517.0 to 19.00.68.0 to 10.0
A23040.081.02.00.050.0317.0 to 20.0-8.0 to 13.0
A43160.081.02.00.050.0316.0 to 18.52.0 to 3.010.0 to 14.4
  • Maximum values unless otherwise stated.
  • Types A2 and A4 may contain up to a maximum of 4% copper.
  • The selection of steel grades within a group is the prerogative of the manufacturer, unless the purchaser has specified particular steels to ISO or national standards.
  • Different grades of steel may be used as long as all physical and mechanical properties and the corresponding corrosion resistance of the finished product are achieved.  Only when all these conditions are fulfilled may finished articles be marked in accordance with DIN 267 Part 11.

Mechanical Properties-Austenitic Grades

Bolts, Screws and Studs

GradeProperty
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
707004500.4d700=<M20
808006000.3d800=<M20

Comparison: US and ISO (DIN) Stainless Steels

Tensile Load

A2 and A4 as compared to 304 and 316Percent difference from US - Stainless Steel
up to M2044% higher
M22 and over6% 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

DiameterLoad 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
M3225014200.9610360120
M4396024902.21070640210
M5639040304.317301040350
M6904057007.324401470490
M8164701038017.744502670890
M10261001644035.5705042301410
M12379302390061.31024061502050
M167065044510147.119080114503820
M2011025069460285.129770178605950
1)The values correspond to 100% of the 0.2%

Notes on application:

  • When selecting the correct screw diameter it should be ensured that the total load on the screw does not exceed 90% of the standardized 0.2% yield stress.  Care should be taken to ensure correct initial tensioning, with a torque wrench wherever possible.

  • Experience has shown that a utilization of 70% of the total load is reasonable average for the initial stressing force to allow additional forces in service to be taken up.

**The table above is only intended as an aid for quick comparison**


Comparative International Stainless Steel Grades

BritishFrenchGermanItalianJapaneseSwedishUSA
304S21Z12CN17.081.4310X12CrNi 17 07SUS30114 23 31301
304S31   SUS30214 23 32302
304S15
304S16
Z8CN18.091.4301X5CrNi 18 10SUS30114 23 33304
304S11Z2CN18.101.4306X2CrNi 18 11SUS304L14 23 52304L
305S19Z8CN18.12 X8CrNi 18 12SUS305 305
309S24Z15CN24.13 X16CrNi 23 14SUS309 309
310S24Z12CN25.201.4845Z22CrNi 25 20SUS310S14 23 61310
315S16    14 23 40 
316S31
316S33
Z6CND17.111.4401
1.4436
X8CrNiMo 17 13SUS31614 23 43
14 23 47
316
316S11
316S13
Z2CND17.121.4404
1.4435
X2CrNiMo 17 12SUS316L14 23 53
14 23 48
316L
317S12Z2CND19.151.4435X2CrNiMo 18 16SUS317L14 23 67317L
317S16 1.4436 SUS31714 23 66317
320S31
320S33
Z8CND17.121.4571
1.4573
  14 23 50 
321S31Z6CNT18.121.4541X6CrNiTi 18 11SUS32114 23 37321
347S31Z6CNNb18.111.4558X6CrNiNb 18 11
X8CrNiNb 18 11
SUS34714 23 38347
403S17Z6C131.4000X6Cr13SUS40314 23 01403
405S17Z6CA131.4002Z6CrA1 13SUS405 405
409S19 1.4512   409
430S17Z8C171.4016X8Cr 17SUS43014 23 20430
434S17Z8CD17.011.4113X8CrMo 17SUS43414 23 25434
410S21Z12C131.4006
1.4024
X12Cr 13SUS41013 23 02410
410S45Z30C13 X30Cr 13SUS420JS14 23 04420

*All information is strictly informative

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