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Home Material ASTM A608/A608M-2020
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Grade HK30
USA UNS J94203
Corresponding Standard ASTM A608/A608M-2020
Standard Specification for Centrifugally Cast Iron-Chromium-Nickel High-Alloy Tubing for Pressure Application at High Temperatures
Classification Cast Steel
HK30 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo
Minimum Value 0.25 0.5 - - - 23 19 -
Maximum Value 0.35 2 1.5 0.04 0.04 27 22 0.5
HK30 Mechanical Properties
Test Temperature Tensile Strength
σb
Mpa 		Elongation or Extension Rate
δ
%
≥180
≥97 ≥9
≥52 ≥18
≥25 ≥24
1 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
ZG40Cr25Ni20Si2 C53901 SCH 21 SCH 21 HRSC 21 HK30 J94203 GX40NiCrSi25-20 GX40NiCrSi25-20 1.4848 Z40CN25.20M ≈15Х23Н18Л 310C40
2 Approximate Comparison Table Corrosion-Resistant Cast Steels
China Japan United States Germany Russia
GB JIS ASTM DIN EN/DIN W-Nr. GOST
ZG1Cr25Ni20Si2 SCH21 HK30 G-X15CrNi2520 1.4840 1Х25Н20С2
3 Approximate Comparison Table Heat-Resistant Cast Steels and Alloys
China Japan United States Germany Russia
GB JIS ASTM UNS DIN EN/DIN W-Nr. GOST
ZG1Cr25Ni20Si2 SCH21 HK-30 J94203 G-X15CrNiSi25 20 1.4840 15Х23Н18Л

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