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Grade 9Cr18
China ISC T20900
Corresponding Standard GB /T 1299-2025
Tool and Mould Steels
Classification Tool Steel
Properties Corrosion Resistance
9Cr18 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.9 - - - - 17 - -
Maximum Value 1 0.8 0.8 0.025 0.02 19 0.6 0.25
• Smelting method: Vacuum degassing
9Cr18 Mechanical Properties
condition Heat Treatment or Condition
Hardness
HBW
condition of delivery Annealing ≤255
condition of delivery Pre-hardening By mutual agreement
Specimen Quenching at 1000-1050°C, oil cooling HRC: ≥55
New and Old Grade Replacement List
Corresponding Standard Grade
GB /T 1299-2014
Grade
China ISC
GB /T 1299-2025
Grade
China ISC
1 Approximate Comparison Table Stainless Bearing Steel
China Taiwan, China Japan South Korea Russia
GB ISC CNS JIS KS GOST
9Cr18 S44090 440C SUS440C STS440C 95Х18
2 Approximate Comparison Table Martensitic Stainless Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST
108Cr17
(11Cr17)
9Cr18 		S44096 440C SUS 440C STS 440C 440C S44004 X105CrMo 17
A-1b
(ISO 683-13-1986) 		X105CrMo 17 1.4125 Z100CD17 X105CrMo 17 1.4125 95Х18
3 Approximate Comparison Table Plastic Mold Steel
China Japan United States Germany
GB ISC JIS ASTM DIN EN/DIN W-Nr.
9Cr18 T44093 SUS 440C 440C X45Cr13 1.3541
9Cr18 Corresponding Standards(Same grade name, different standards)
1 GB /T 20878-2007
(9Cr18) 95Cr18 S44090
2 GB /T 1220-2007
(9Cr18) 95Cr18 S44090
3 GB /T 4356-2016
(9Cr18) 95Cr18 S44090
4 GJB 2294-1995
9Cr18
5 GB /T 1299-2014
9Cr18 S44093
6 YB /T 096-2015
(9Cr18) 95Cr18
7 GB /T 3086-2019
(9Cr18) G95Cr18 B21890
8 GJB 2294A-2014
(9Cr18) 95Cr18
9 GB /T 20878-2024
(9Cr18) 95Cr18 S44090
10 GB /T 1299-2025
9Cr18 T20900

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