300 Series (Austenitic) Stainless Steel

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Grade Designation and Composition For Stainless Steel Header

European Designation EN 10088-2 2005 Former BS Standard American European Designations chemical composition (% weight)
Number Name BS 1554 1990 nearest fit AISI nearest fit ASTM UNS nearest fit C (max) Si (max) Mn (max) P (max) S (max) N Cr Ni Mo Others
1.4310 X10 Cr Ni 18-8 302S26 302 S 30100 0.05 – 0.15 2.00 2.00 0.045 0.015 0.11 16.00 – 19.00 6.00 – 9.50
1.4307 X2 Cr Ni 18-9 304S11 304L S 30403 0.03 1.00 2.00 0.045 0.015 0.11 17.50 – 19.50 8.00 – 10.50
1.4301 X5 Cr Ni 18-10 304S31 304 S 30400 0.07 1.00 2.00 0.045 0.015 0.11 17.50 – 19.50 8.00 – 10.50
1.4404 X2 Cr Ni Mo 17-12-2 316S14 316L S 31603 0.03 1.00 2.00 0.045 0.015 0.11 16.50 – 18.50 10.00 – 13.00 2.00 – 2.50
1.4401 X5 Cr Ni Mo 17-12-2 316S42 316 S 31600 0.07 1.00 2.00 0.045 0.015 0.11 16.50 – 18.50 10.00 – 13.00 2.00 – 2.50
1.4541 X6 Cr Ni Ti 18-10 321S31 321 S 32100 0.08 1.00 2.00 0.045 0.015 n/a 17.00 – 19.00 9.00 – 12.00 Ti = 5 x C to 0.70

Mechanical Properties Annealed Stainless Steel Header

European Designation EN 10088-2 2005 Former BS Standard American Maximum tensile strength N/mm²
Number Name BS 1554 1990 nearest fit AISI nearest fit ASTM UNS nearest fit Wire dia 13.0 – 6.0mm Wire dia 6.00 – 1.50mm Wire dia 1.50 – 0.50mm Wire dia 0.50 – 0.10mm
1.4310 X10 Cr Ni 18-8 302S26 302 S 30100 750 800 880 900
1.4307 X2 Cr Ni 18-9 304S11 304L S 30403 650 750 775 850
1.4301 X5 Cr Ni 18-10 304S31 304 S 30400 700 770 820 870
1.4404 X2 Cr Ni Mo 17-12-2 316S14 316L S 31603 650 750 775 850
1.4401 X5 Cr Ni Mo 17-12-2 316S42 316 S 31600 700 770 820 870
1.4541 X6 Cr Ni Ti 18-10 321S31 321 S 32100 700 770 820 870

Mechanical Properties Cold Drawn Stainless Steel Header

Steel Grade : 1.4310 (302) 1.4401 (316)
Nominal Diameter (mm) Normal tensile strength (NS), min High tensile strength (HS), min Minimum tensile strength N/mm²
less than 0.20 2200 2350 1725
0.20 – 0.30 2150 2300 1700
0.30 – 0.40 2100 2250 1675
0.40 – 0.50 2050 2200 1650
0.50 – 0.65 2000 2150 1625
0.65 – 0.80 1950 2100 1600
0.80 – 1.00 1900 2050 1575
1.00 – 1.25 1850 2000 1550
1.25 – 1.50 1800 1950 1500
1.50 – 1.75 1750 1900 1450
1.75 – 2.00 1700 1850 1400
2.00 – 2.50 1650 1750 1350
2.50 – 3.00 1600 1700 1300
3.00 – 3.50 1550 1650 1250
3.50 – 4.25 1500 1600 1225
4.25 – 5.00 1450 1550 1200
5.00 – 6.00 1400 1500 1150
6.00 – 7.00 1350 1450 1125
7.00 – 8.50 1300 1400 1075
8.50 – 10.00 1250 1350 1050

Applications Header

European Designation EN 10088-2 2005 AISI Nearest fit Service Properties Applications
1.4310 / X10 Cr Ni 18-8 302 Lower Chrome and Nickel content increases the work hardening rate to give high strength and abrasion resistance. Particularly suitable for components requiring stretch forming, high strength or good spring properties. Springs, clips, fasteners, weaving and braiding, orthodontic wires, connectors.
1.4301 X5 Cr Ni 18-10 304 The most popular grade in the austenitic (300) series, exhibiting good corrosion resistance and formability. Ropes, weaving, braiding springs
1.4307 X2 Cr Ni 18-9 304L Reduced Carbon content for better corrosion resistance in welded structures than the base grade 1.4301 (AISI 304). Ropes, weaving, braiding, springs for corrosive environments
1.4401 X5 Cr Ni Mo 17-12-2 316 Molybdenum is added to increase the corrosion resistance. Additionally it has improved non-magnetic properties. Springs, clips, fasteners, weaving, braiding in chemical, petrochemical and marine applications.
1.4404 X2 Cr Ni Mo 17-12-2 316L Reduced Carbon content for better corrosion resistance. As for 316 above, but for more demanding environments.
1.4541 X6 Cr Ni Ti 18-10 321 Titanium is added to oppose chromium carbide precipitation and remove the risk of deteriorating corrosion performance. Fasteners, springs, locking wires, The use of “stabilised” grades is favoured by the aerospace industry, particularly in engine related applications.