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STAINLESS STEEL

 

Designation System for Stainless Steel (ISO 3506 1979)

Composition GroupsAusteniticFerriticMartensitic
Identification of Steel GradesA1, A2, A4F1C1, C4C3
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
CSiMnPS CrMoNi

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

  • 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

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 316Percent 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

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

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:

  • 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

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

© 1998 Conex Metals.

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