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Grade XM-13
USA UNS S13800
Corresponding Standard ASTM A705/A705M-2023
Standard Specification for Age-Hardening Stainless Steel Forgings
Classification Precipitation-Hardening Stainless Steel
XM-13 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo N Al
Minimum Value - - - - - 12.25 7.5 2 - 0.9
Maximum Value 0.05 0.1 0.2 0.01 0.008 13.25 8.5 2.5 0.01 1.35
XM-13 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: 925±15 °C（cool as required to below 16 °C） HRC:≤38
HB≤363
t≤300 (L) H950 Hardening or Aging Treatment, 510 °C, 4h, air cool ≥1520 ≥1420 ≥10 ≥45 HRC:≥45
HB≥430
t≤300 (T) H950 Hardening or Aging Treatment, 510 °C, 4h, air cool ≥1520 ≥1420 ≥10 ≥35 HRC:≥45
HB≥430
t≤300 (L) H1000 Hardening or Aging Treatment, 540 °C, 4h, air cool ≥1420 ≥1310 ≥10 ≥50 HRC:≥43
HB≥400
t≤300 (T) H1000 Hardening or Aging Treatment, 540 °C, 4h, air cool ≥1420 ≥1310 ≥10 ≥40 HRC:≥43
HB≥400
t≤300 (L) H1025 Hardening or Aging Treatment, 550 °C, 4h, air cool ≥1280 ≥1210 ≥11 ≥50 HRC:≥41
HB≥380
t≤300 (T) H1025 Hardening or Aging Treatment, 550 °C, 4h, air cool ≥1280 ≥1210 ≥11 ≥45 HRC:≥41
HB≥380
t≤300 (L) H1050 Hardening or Aging Treatment, 565 °C, 4h, air cool ≥1210 ≥1140 ≥12 ≥50 HRC:≥40
HB≥372
t≤300 (T) H1050 Hardening or Aging Treatment, 565 °C, 4h, air cool ≥1210 ≥1140 ≥12 ≥45 HRC:≥40
HB≥372
t≤300 (L) H1100 Hardening or Aging Treatment, 595 °C, 4h, air cool ≥1030 ≥930 ≥14 ≥50 HRC:≥34
HB≥313
t≤300 (T) H1100 Hardening or Aging Treatment, 595 °C, 4h, air cool ≥1030 ≥930 ≥14 ≥50 HRC:≥34
HB≥313
t≤300 (L) H1150 Hardening or Aging Treatment, 620 °C, 4h, air cool ≥930 ≥620 ≥14 ≥50 HRC:≥30
HB≥283
t≤300 (T) H1150 Hardening or Aging Treatment, 620 °C, 4h, air cool ≥930 ≥620 ≥14 ≥50 HRC:≥30
HB≥283
t≤300 (L) H1150M Hardening or Aging Treatment, 760 °C for 2h, air cool plus 620 °C for 4h, air cool ≥860 ≥585 ≥16 ≥55 HRC:≥26
HB≥259
t≤300 (T) H1150M Hardening or Aging Treatment, 760 °C for 2h, air cool plus 620 °C for 4h, air cool ≥860 ≥585 ≥16 ≥55 HRC:≥26
HB≥259
* （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.
Approximate Comparison Table Precipitation Hardening Stainless Steel
China United States International Organization for Standardization European Standard
GB ISC ASTM UNS ISO Numerical Grade EN Numerical Grade
04Cr13Ni8Mo2Al
GB/T 20878-2024 		S51380 XM-13
ASTM A959 		S13800 X3CrNiMoAl13-8-3
ISO 15510 		4534-138-00-X X3CrNiMoAl13-8-3
EN 10088-1 		1.4534
XM-13 Corresponding Standards(Same grade name, different standards)
1 ASTM A959-2004
XM-13 S13800
2 ASTM A564/A564M-2019(a)
XM-13 S13800
3 ASTM A693-2013
XM-13 S13800
4 ASTM F899-2020
XM-13 S13800
5 ASTM A959-2019
XM-13 S13800
6 ASTM A705/A705M-2023
XM-13 S13800

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