A martensitic precipitation-hardening stainless steel that hardens with a single-step aging treatment. The part is machined or cold formed in the soft solution-treated state (Condition A), then hardened in one cycle between 482 and 566 \u00b0C.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 Flat bar \u00b7 Plate \u00b7 Sheet \u00b7 Tube \u00b7 Forging<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS 5617<\/b> (bars, wire, forgings \u2014 vacuum induction plus vacuum consumable electrode melted) \u00b7 AMS 5860<\/b> (sheet, strip, plate) \u00b7 AMS 5578<\/b> (welded tubing) \u00b7 AMS 5672<\/b> (spring temper wire) \u00b7 ASTM A564 \/ ASME SA-564 Type XM-16 (bars and shapes) \u00b7 ASTM A693 Type XM-16 (plate, sheet, strip) \u00b7 ASTM A313 Type XM-16 (spring wire) \u00b7 ASTM F899 (surgical instrument steel) \u00b7 W.Nr. 1.4543
THE MOST IMPORTANT DIFFERENCE: ASTM A564 defines ONLY H900, H950 and H1000 for Type XM-16. There is NO XM-16 equivalent of the H1025 \/ H1075 \/ H1100 \/ H1150 conditions that exist for 17-4 PH and 15-5 PH.<\/span><\/div>\n<\/div>\n\n
Advantage<\/div>\n
A two-sided advantage, measured with the minimum values of the same standard (ASTM A564) in the same condition. STRENGTH: in H900 the XM-16 minimum is 1620 MPa tensile \/ 1515 MPa yield;<\/div>\n<\/div>\n
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Welding<\/div>\n
Process: shielded fusion welding and resistance welding are suitable. Oxyacetylene welding is NOT recommended \u2014 carbon pickup occurs in the weld (Carpenter). Preheat: not required; Carpenter states that preheating is not required to prevent cracking during welding.<\/div>\n<\/div>\n
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Limits<\/div>\n
TEMPERATURE: Carpenter’s only numerical limit reads “short exposures to elevated temperatures can be considered, provided the maximum temperature is at least 28 \u00b0C (50 \u00b0F) LESS than the aging temperature”. For a part aged at H900 (482 \u00b0C) that means roughly 454 \u00b0C for short exposure, and it is NOT a continuous service rating.<\/div>\n<\/div>\n