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Aircraft Stainless Steel BS S80 (MSRR 6573 / AMS 5628/ 431S29)


Technical Data Sheet

BS 7S80 is the British aerospace standard for 431 stainless steel. Designed to combine good corrosion resistance and high mechanical properties after heat treatment, it is used widely used in aerospace and defence applications. The grade is generally supplied in the hardened and tempered condition, designation S80D.

Chemical Composition Limits
Weight% C Si Mn P+S max Cr Ni Others (max)
4-S80
5-S80
6-S80
7- S80
Bar		 0.12-0.20 1.00 max 1.00 max P 0.030
S 0.025		 15-18 2-3 Mo 0.3 / Co 0.05 / Cu 0.3/ Nb 0.05 / Sn 0.02 / Ti 0.05 / V 0.20 / W 0.05
Chemically similar British Specifications BS.970 Pt4 431 S29 (EN57)
Weight% C Si Mn P+S max Cr Ni Others (max)
431S29 (EN57) 0.12-0.20 0.80 max 1.00 max P 0.040
S 0.030		 15-18 2-3 -
Other Chemically similar Specifications
Weight% C Si Mn P+S max Cr Ni Others (max)
AISI 431 SAE - 51431 0.20 max 1.00 max 1.00 max P 0.040
S 0.030		 15-17 1.25-2.5 -
AMS 5628D 0.12-0.17 0.20-0.60 0.30-0.80 P 0.040
S 0.030		 15.50-17 2-3 Mo 0.50 / Cu 0.50 / N 0.10
MIL-S-86213
431 		0.20 max 1.00 max 1.25 max P 0.040
S 0.030		 15-17 1.25-2.5 -
MIL-S-8967
(ASG) 		0.13-0.17 0.20-0.60 0.30-0.80 0.025 15.50-16.50 2-3 Mo 0.25
MIL-S-187320 0.13-0.17 0.20-0.60 0.30-0.80 P 0.040
S 0.030		 15.50-16.50 2-3 Mo 0.25 / N 0.10
MSRR 6573 - - - - - - -
Z15 CN17-03 - - - - - - -
BACM 85 - - - - - - -
WS 1.4044 - - - - - - -
WS 1.4057
XX22CrNi17		 0.15-0.23 1.00 max 1.00 max P 0.045
S 0.030		 16-18 1.50-2.50 -
UNI X16CrNi16 0.10-0.20 1.00 max 1.00 max P 0.040
S 0.030		 15-17 1.50-2.5 -

Typical Mechanical Properties

 

Grade Treatment Tensile Strength Rm N/mm² Proof Stress Rp 0.2, N/mm² Elongation A% √5.65 % IZOD Impact FT/ Lbs Hardness HB Ruling Section Product Range Colour Code
6S80 HT 880/1080 690 12 25 255-321 2.5" Round
Square
Flat
Hexagon		 Brown
Black
Red
7S80D HT - - - 15 - 2.5-4"

Availability
Alloy S80 (431S29) is available in Bar and Rod. For all stock availability contact Sales.

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Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.