Martensitic precipitation-hardening stainless steel. The part is machined in the solution-annealed state (Condition A), then brought to the required strength by a single aging cycle between 482 and 621 \u00b0C.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 Flat bar \u00b7 Plate \u00b7 Sheet \u00b7 Pipe \u00b7 Forging<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS 5643<\/b> (bars, wire, forgings, mechanical tubing, rings) \u00b7 AMS 5622<\/b> (same forms, consumable-electrode remelted) \u00b7 AMS 5604<\/b> (sheet, strip, plate) \u00b7 AMS 5825<\/b> (welding wire) \u00b7 AMS 5827<\/b> (covered welding electrodes) \u00b7 ASTM A564 \/ ASME SA-564 Type 630 (bars, wire, shapes) \u00b7 ASTM A693 \/ ASME SA-693 Grade 630 (plate, sheet, strip) \u00b7 ASTM A705 \/ ASME SA-705 Grade 630 (forgings) \u00b7 EN 10088-3 1.4542
AMS 5643 and AMS 5622 cover the same UNS S17400 alloy; the difference is the melting route \u2014 AMS 5622 requires consumable-electrode remelted (ESR\/VAR) material. AMS 5827G appears in the SAE catalogue as cancelled in September 2000;<\/span><\/div>\n<\/div>\n\n
Advantage<\/div>\n
Strength is set by a single low-temperature cycle that requires no high-temperature quench. A part machined to finished size in Condition A is aged for 1-4 hours between 482 and 621 \u00b0C and air cooled, giving six different minimum yield levels from one alloy: 1170 MPa at H900 down to 725 MPa at\u2026<\/div>\n<\/div>\n
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Welding<\/div>\n
Filler metal: for matching filler, AWS A5.9 ER630 (wire) \/ AWS A5.4 E630 (covered electrode); AMS equivalents are
AMS 5825<\/b> and AMS 5827<\/b>. Where base-metal strength is not required, austenitic AWS 308L is used \u2014 this filler does not respond to aging. Preheat: not normally required;<\/div>\n<\/div>\n\n
Limits<\/div>\n
Continuous service temperature is limited to roughly 300-315 \u00b0C; prolonged exposure above this reduces toughness in the precipitation-hardened conditions. The H900 condition is markedly susceptible to chloride stress corrosion cracking;<\/div>\n<\/div>\n