AMS5628
COMMON NAMES:
431 Stainless
UNS S43100
FORM & USE:
AMS5628 is a heat treatable, corrosion resistant steel. We hold this grade in round bar form. The material is typically used for parts requiring corrosion resistance and high strength at room temperature.
SIZES STOCKED:
6.35 mm diameter – 304.8 mm diameter
GENERAL:
Material is aircraft-quality conforming to AMS2303.
Tolerances are in accordance with AMS2241.
CONDITION:
Annealed
CHEMISTRY:
| C | Mn | Si | P | S | Cr | Ni | Mo | Cu | N |
|---|---|---|---|---|---|---|---|---|---|
| 0.12 – 0.17 | 0.30 – 0.80 | 0.20 – 0.60 | < 0.040 | < 0.030 | 15.50 – 16.50 | 2.00 – 3.00 | < 0.25 | < 0.50 | < 0.010 |
FINISH:
Up to 12.7 mm diameter – cold drawn or ground
12.7 mm diameter – 38 mm diameter – ground or smooth turned
Above 38 mm diameter – ground or turned
HEAT TREATMENT:
Base material annealed.
For capability of material as tempered: specimen is soaked at 1010oC to 1038oC for minimum 30 minutes, quenched in agitated oil at 38oC to 66oC, cooled to room temperature in water, then soaked in a liquid at -62oC to -84oC for not less than 2 hours, then temper in air at 274oC to 302oC for 2 hours and retemper in air at 274oC to 302oC for 2 hours.
MATERIAL PROPERTIES:
Tensile Properties:
| Minimum Tensile Strength | Minimum Yield strength at 0.2% Offset | Minimum Elongation in 2” or 4d | Minimum Reduction of Area | Hardness | |
|---|---|---|---|---|---|
| Ksi | Ksi | % | % | ||
| Annealed: | – | – | – | – | <302 HB, determined at 1/4T |
| As Tempered: | 200 | 150 | 10 | 40 | – |
A “-“ indicates no requirement for the property.
Microstructure: capability specimens soaked at 1010oC to 1038oC for minimum 30 minutes, quenched in agitated oil at 38oC to 66oC, cooled to room temperature in water, then temper in air at 621oC to 647oC for at least 3 hours.
The test is carried out on a longitudinal specimen (minimum length & width of 6.35 mm), polished, etched and examined at 250x magnification. Acceptance criteria:
- Banded ferrite – no banded free ferrite in excess of that shown in figure 3 of AMS5628.
- Blocky ferrite – to contain no more than 4% blocky ferrite.
- Banded Austenite – no banded retained austentite in excess of that shown in figure 5 of AMS5628.
- Blocky Austenite – allowed. Not a cause for rejection.
- Average Grain size – ASTM No 3 or finer determined by comparison with a heat treated, polished and etched specimen with the chart in ASTM E112.
Full material traceability, with anti-counterfeit measures, is maintained at all times, and full certification is provided, including producer’s name and country where the material was melted.