XM-12 S15500 - ASTM A705/A705M-2023

Grade	XM-12
USA UNS	S15500
Corresponding Standard	ASTM A705/A705M-2023 Standard Specification for Age-Hardening Stainless Steel Forgings
Classification	Precipitation-Hardening Stainless Steel

XM-12 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Nb
Minimum Value	-	-	-	-	-	14	3.5	2.5	0.15
Maximum Value	0.07	1	1	0.04	0.03	15.5	5.5	4.5	0.45

XM-12 Mechanical Properties

Thickness t mm	Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
/		Solution Treatment: 1040±15 °C（cool as required to below 90 °F [32 °C]）					HRC:≤38 HB≤363
t≤300 (L)	H900	Hardening or Aging Treatment, 480 °C, 1h, air cool	≥1310	≥1170	≥10	≥35	HRC:≥40 HB≥388
t≤300 (T)	H900	Hardening or Aging Treatment, 480 °C, 1h, air cool	≥1310	≥1170	≥6	≥15	HRC:≥40 HB≥388
t≤300 (L)	H925	Hardening or Aging Treatment, 495 °C, 4h, air cool	≥1170	≥1070	≥10	≥38	HRC:≥38 HB≥375	≥6.8
t≤300 (T)	H925	Hardening or Aging Treatment, 495 °C, 4h, air cool	≥1170	≥1070	≥7	≥20	HRC:≥38 HB≥375
t≤300 (L)	H1025	Hardening or Aging Treatment, 550 °C, 4h, air cool	≥1070	≥1000	≥12	≥45	HRC:≥35 HB≥331	≥20
t≤300 (T)	H1025	Hardening or Aging Treatment, 550 °C, 4h, air cool	≥1070	≥1000	≥8	≥27	HRC:≥35 HB≥331	≥14
t≤300 (L)	H1075	Hardening or Aging Treatment, 580 °C, 4h, air cool	≥1000	≥860	≥13	≥45	HRC:≥32 HB≥311	≥27
t≤300 (T)	H1075	Hardening or Aging Treatment, 580 °C, 4h, air cool	≥1000	≥860	≥9	≥28	HRC:≥32 HB≥311	≥20
t≤300 (L)	H1100	Hardening or Aging Treatment, 595 °C, 4h, air cool	≥965	≥795	≥14	≥45	HRC:≥31 HB≥302	≥34
t≤300 (T)	H1100	Hardening or Aging Treatment, 595 °C, 4h, air cool	≥965	≥795	≥10	≥29	HRC:≥31 HB≥302	≥20
t≤300 (L)	H1150	Hardening or Aging Treatment, 620 °C, 4h, air cool	≥930	≥725	≥16	≥50	HRC:≥28 HB≥277	≥41
t≤300 (T)	H1150	Hardening or Aging Treatment, 620 °C, 4h, air cool	≥930	≥725	≥11	≥30	HRC:≥28 HB≥277	≥27
t≤300 (L)	H1150M	Hardening or Aging Treatment, 760 °C for 2h, air cool plus 620 °C for 4h, air cool	≥795	≥515	≥18	≥55	HRC:≥24 HB≥255	≥75
t≤300 (T)	H1150M	Hardening or Aging Treatment, 760 °C for 2h, air cool plus 620 °C for 4h, air cool	≥795	≥515	≥14	≥35	HRC:≥24 HB≥255	≥47

* （L）：Longitudinal；（T）：Transverse。

① Either Rockwell C hardness or Brinell is permissible. On sizes of 12.70 mm and smaller, Rockwell C is preferred.

1 Approximate Comparison Table Precipitation Hardening Stainless Steel

China	United States			Germany	European Standard
GB	ASTM	UNS	SAE	W-Nr.	EN
0Cr15Ni5Cu4Nb	S15500	XM12	15-5PH	1.4545	X5CrNiCuNb15-5

2 Approximate Comparison Table Precipitation Hardening Stainless Steel

China		United States
GB	ISC	ASTM	UNS
05Cr15Ni5Cu4Nb (0Cr15Ni5Cu4Nb) GB/T 20878-2024	S51550	XM-12 ASTM A959	S15500

XM-12 Corresponding Standards(Same grade name, different standards)

1	ASTM A959-2004
	XM-12 S15500
2	ASTM A564/A564M-2019(a)
	XM-12 S15500
3	ASTM A693-2013
	XM-12 S15500
4	ASTM A959-2019
	XM-12 S15500
5	ASTM A705/A705M-2023
	XM-12 S15500

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!