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E: ssas@bssa.org.uk
E: ssas@bssa.org.uk
British Standard Aerospace products for sheet and strip have their own individual standards and are not summarized in a single Standard. The table shows most of the grade numbers that are commonly encountered.
Composition (Max, unless stated).
S, 0.025% and P, 0.035% maxima apply to all grades shown , except grade S538 where the P maximum is 0.030%
Tensile Strength (Min, unless stated)
Hardness HB (Max, unless stated)
Status; ‘C’ represents Current, ‘W’ represents Withdrawn
Treatments: CR = Cold Rolled ; CR+T = Cold Rolled and Tempered ; FHT = Final Heat Treatment ; S = Softened
For heat treatable grades, only the Finally Heat Treated mechanical strength values are shown.
| Standard | Status | C | Si | Mn | Cr | Mo | Ni | Others | Treatment | Proof (MPa) | UTS (MPa) | El.% | Hard. (HB) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S524(1969) | C | 0.08 | 0.2/1.0 | 0.5/2.0 | 17.0/19.0 | 1.0 | 9.0/11.0 | Ti 5xC/0.70 | CR or CR+T | 640 | 800/1100 | 15 | – |
| S525(1969) | C | 0.08 | 0.2/1.0 | 0.5/2.0 | 17.0/19.0 | 1.0 | 9.0/11.0 | Nb 10xC/1.0 | CR or CR+T | 640 | 800/1100 | 15 | – |
| S526(1969) | C | 0.08 | 0.2/1.0 | 0.5/2.0 | 17.0/19.0 | 1.0 | 9.0/11.0 | Ti 5xC/0.70 | S | 210 | 540 | 40 | 179 |
| S527(1969) | C | 0.08 | 0.2/1.0 | 0.5/2.0 | 17.0/19.0 | 1.0 | 9.0/11.0 | Nb 10xC/1.0 | S | 210 | 540 | 40 | 179 |
| S528(1970) | C | 0.12 | 0.2/1.0 | 0.5/2.0 | 22.0/25.0 | – | 13.0/16.0 | Ti 5xC/0.90 | S | 210 | 540 | 30 | 179 |
| S529(1970) | W | 0.12 | 0.2/1.0 | 0.5/2.0 | 22.0/25.0 | – | 13.0/16.0 | Nb 10xC/1.4 | S | 210 | 540 | 30 | 179 |
| S530(1970) | C | 0.12 | 0.2/1.0 | 0.5/2.0 | 23.0/26.0 | – | 16.0/19.0 | Nb 5xC/0.9 | S | 210 | 540 | 30 | 179 |
| S531(1970) | W | 0.12 | 0.2/1.0 | 0.5/2.0 | 23.0/26.0 | – | 16.0/19.0 | Nb 10xC/1.4 | S | 210 | 540 | 30 | 179 |
| S532(1969) | C | 0.04/0.07 | 0.60 | 0.80/1.80 | 15.3/16.3 | 1.2/2.0 | 5.0/5.8 | Cu 1.4/2.1 Ti 0.05/0.15 | FHT | 800 | 980/1180 | 8 | 293/363 |
| S533(1969) | C | 0.04/0.07 | 0.60 | 0.80/1.80 | 15.3/16.3 | 1.2/2.0 | 5.0/5.8 | Cu 1.4/2.1 Ti 0.05/0.15 | FHT | 980 | 1180/1370 | 6 | 375/429 |
| S536(1970) | C | 0.03 | 0.2/1.0 | 0.5/2.0 | 17.5/19.0 | – | 9.0/12.0 | – | S | 190 | 500/700 | 40 | 170 |
| S537(1970) | C | 0.03 | 0.2/1.0 | 0.5/2.0 | 16.5/18.5 | 2.25/3.0 | 11.0/14.0 | – | S | 190 | 500/700 | 40 | 170 |
| S538(1975) | C | 0.08/0.13 | 0.35 | 0.5/0.9 | 11.0/12.5 | 1.5/2.0 | 2.0/3.0 | N 0.02/0.04 V 0.25/0.40 | FHT | 760 | 930/1130 | 9 | 320/380 HV |