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Grade XM-25
USA UNS S45000
Corresponding Standard ASTM A705/A705M-2023
Standard Specification for Age-Hardening Stainless Steel Forgings
Classification Precipitation-Hardening Stainless Steel
XM-25 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Mo More
Minimum Value - - - - - 14 5 1.25 0.5 Nb≥8C
Maximum Value 0.05 1 1 0.03 0.03 16 7 1.75 1
XM-25 Mechanical Properties
Thickness
t
mm		 Mark
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
/ Solution Treatment: 1040±15 °C（cool rapidly） ②
≥860		 ≥655 ≥10 ≥40 HRC:≤33
HB≤311
t≤200 H900 Hardening or Aging Treatment, 480 °C, 4h, air cool ≥1240 ≥1170 ≥10 ≥40 HRC: ≥39
HB: ≥363
t≤300 (L) H900 Hardening or Aging Treatment, 480 °C, 4h, air cool ≥1240 ≥1170 ≥10 ≥40 HRC: ≥39
HB: ≥363
t≤300 (T) H900 Hardening or Aging Treatment, 480 °C, 4h, air cool ≥1240 ≥1170 ≥6 ≥20 HRC: ≥39
HB: ≥363
t≤200 H950 Hardening or Aging Treatment, 510 °C, 4h, air cool ≥1170 ≥1100 ≥10 ≥40 HRC: ≥37
HB: ≥341
t≤300 (L) H950 Hardening or Aging Treatment, 510 °C, 4h, air cool ≥1170 ≥1100 ≥10 ≥40 HRC: ≥37
HB: ≥341
t≤300 (T) H950 Hardening or Aging Treatment, 510 °C, 4h, air cool ≥1170 ≥1100 ≥7 ≥22 HRC: ≥37
HB: ≥341
t≤200 H1000 Hardening or Aging Treatment, 540 °C, 4h, air cool ≥1100 ≥1030 ≥12 ≥45 HRC: ≥36
HB: ≥331
t≤300 (L) H1000 Hardening or Aging Treatment, 540 °C, 4h, air cool ≥1100 ≥1030 ≥12 ≥45 HRC: ≥36
HB: ≥331
t≤300 (T) H1000 Hardening or Aging Treatment, 540 °C, 4h, air cool ≥1100 ≥1030 ≥6 ≥27 HRC: ≥36
HB: ≥331
t≤200 H1025 Hardening or Aging Treatment, 550 °C, 4h, air cool ≥1030 ≥965 ≥12 ≥45 HRC: ≥34
HB: ≥321
t≤200 H1050 Hardening or Aging Treatment, 565 °C, 4h, air cool ≥1000 ≥930 ≥12 ≥45 HRC: ≥34
HB: ≥321
t≤300 (L) H1050 Hardening or Aging Treatment, 565 °C, 4h, air cool ≥1000 ≥930 ≥12 ≥45 HRC: ≥34
HB: ≥321
t≤300 (T) H1050 Hardening or Aging Treatment, 565 °C, 4h, air cool ≥1000 ≥930 ≥9 ≥30 HRC: ≥34
HB: ≥321
t≤200 H1100 Hardening or Aging Treatment, 595 °C, 4h, air cool ≥895 ≥725 ≥16 ≥50 HRC: ≥30
HB: ≥285
t≤300 (L) H1100 Hardening or Aging Treatment, 595 °C, 4h, air cool ≥895 ≥725 ≥16 ≥50 HRC: ≥30
HB: ≥285
t≤300 (T) H1100 Hardening or Aging Treatment, 595 °C, 4h, air cool ≥895 ≥725 ≥11 ≥30 HRC: ≥30
HB: ≥285
t≤200 H1150 Hardening or Aging Treatment, 620 °C, 4h, air cool ≥860 ≥515 ≥15 ≥50 HRC: ≥26
HB: ≥262
t≤300 (L) H1150 Hardening or Aging Treatment, 620 °C, 4h, air cool ≥860 ≥515 ≥18 ≥55 HRC: ≥26
HB: ≥262
t≤300 (T) H1150 Hardening or Aging Treatment, 620 °C, 4h, air cool ≥860 ≥515 ≥12 ≥35 HRC: ≥26
HB: ≥262
* （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.
② 860 to 1140 MPa for sizes up to 13 mm.
③ Only tensile strength applicable to sizes up to ½in. [13 mm].
XM-25 Corresponding Standards(Same grade name, different standards)
1 ASTM A564/A564M-2019(a)
XM-25 S45000
2 ASTM A693-2013
XM-25 S45000
3 ASTM F899-2020
XM-25 S45000
4 ASTM A959-2019
XM-25 S45000
5 ASTM A705/A705M-2023
XM-25 S45000

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