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Grade 321S20
Old Grade
Corresponding Standard BS 970-4-1970
Specification for Wrought steels in the form of blooms,billets,bars and forgings--Part 4:Valve steels
Classification Austenitic Stainless Steel
321S20 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu ◎ Mo ◎ Nb ◎ More
Minimum Value - 0.2 0.5 - - 17 8 - - - Ti: 5C~0.9
Maximum Value 0.12 1 2 0.045 0.03 19 11 0.5 0.7 0.2
321S20 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Specified Plastic Yield Strength
Rp0.2
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
Steel Softening treatment ≥52kgf/mm2
（≥510MPa）		 ≥21kgf/mm2
（≥206MPa）		 ≥40 ≤183
Bar, d≤19 Cold draw ≥88 kgf/mm2
（≥862 MPa）		 ≥71 kgf/mm2
（≥696 MPa）		 ≥12
bar, 19.05＜d≤25.4 Cold draw ≥80 kgf/mm2
（≥784M Pa）		 ≥57 kgf/mm2
（≥559 MPa）		 ≥15
Bar, 25.4＜d≤31.75 Cold draw ≥74 kgf/mm2
（≥725 MPa）		 ≥46 kgf/mm2
（≥451 MPa）		 ≥20
Bar, 31.75＜d≤38.1 Cold draw ≥71kgf/mm2
（≥696 MPa）		 ≥35 kgf/mm2
（≥343 MPa）		 ≥28
Bar, 38.1＜d≤44.45 Cold draw ≥66 kgf/mm2
（≥647 MPa）		 ≥31 kgf/mm2
（≥304 MPa）		 ≥28
• The letters P, R, S and T in the table indicate the range of tensile strength of quenched and tempered steels.
• If bars are straightened by reeling or cold rectification the surface becomes work-hardened and the specified maximum Brinell hardness to be obtained on such bars shall be agreed between the manufacturer and the purchaser.
1 Approximate Comparison Table Austenitic Stainless Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO Numerical Grade DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
07Cr19Ni11Ti
(1Cr18Ni11Ti) 		S32169 321 HTP SUS 321 HTP
SUS 321 H 		STS 321 HTP 321H S32109 X7CrNiTi 18-10
X6CrNiTiB 18-10 		4940-321-09-I X12CrNiTi 18-9 1.4878 Z6CNT 18-12 X8CrNiTi 18-10
X6CrNiTiB 18-10 		1.4878
1.4941
1.4940 		12Х18Н10Т 2337 321S20
2 Approximate Comparison Table Austenitic Heat-Resistant Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
07Cr19Ni11Ti
(1Cr18Ni11Ti) 		S32169 321 SUS 321 STS 321 321H S32109 X7CrNiTi 18-10 X12CrNiTi 18-9 1.4878 Z6CNT 18-12 X10CrNiTi 18-10 1.4878 12Х18Н10Т 2337 321S20
3 Approximate Comparison Table Austenitic Stainless Steel
China Japan United States International Organization for Standardization Germany France Russia United Kingdom
GB JIS ASTM/AISI UNS ISO DIN EN/DIN NF EN/NF GOST BS EN/BS
0Cr18Ni11Ti
0Cr18Ni9Ti 		SUS321 321 S32100 15 X10CrNiTi18-9 Z6CNT18.10 08Х18Н10Т 321S12
321S20
321S20 Corresponding Standards(Same grade name, different standards)
1 BS
321S20
2 BS 970-4-1970
321S20 (EN58B) (EN58C)

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