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Grade Grade HH Type 25Cr-12Ni
USA UNS J93503
Corresponding Standard ASTM A297/A297M-2017
Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application
Classification Cast Steel
Grade HH Type 25Cr-12Ni Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo *
Minimum Value 0.2 - - - - 24 11 -
Maximum Value 0.5 2 2 0.04 0.04 28 14 0.5
Grade HH Type 25Cr-12Ni Mechanical Properties
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
%
≥515 ≥240 Gauge distance 50mm: ≥10ⓐ
1 Approximate Comparison Table Heat-Resistant Cast Steels and Alloys
Japan United States
JIS ASTM UNS
SCH 13 HH J93503
2 Approximate Comparison Table Heat-Resistant Cast Steels and Alloys
Japan United States
JIS ASTM UNS
SCH 13A HHtypeⅡ J93503
3 Approximate Comparison Table Heat-Resistant Cast Steels and Alloys
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
ZG40Cr25Ni12Si2 C53881 SCH 13 SCH 13X HRSC 13 HHtypeⅡ J93503 GX40CrNiSi25-12 GX40CrNiSi25-12 1.4837 GX40CrNiSi25-12 ≈40Х24Н12СЛ 309C30
4 Approximate Comparison Table Heat-Resistant Cast Steels and Alloys
Japan United States Germany Russia United Kingdom
JIS ASTM UNS DIN EN/DIN W-Nr. GOST BS EN/BS
SCH13A
SCH17 		HH J93503 G-X40CrNiSi25 21 1.4837 40Х24Н12Л 309C30

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