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Grade 321
USA UNS S32100
Corresponding Standard ASTM A313/A313M-2018
Stainless Steel Spring Wire
Classification Austenitic Stainless Steel
Properties Corrosion Resistance
321 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni More
Minimum Value - - - - - 17 9 Ti≥5×(C+N)
Maximum Value 0.08 1 2 0.045 0.03 19 12
321 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa
d≤0.25 Cold Drawing 1690~1895
0.25＜d≤0.38 Cold Drawing 1655~1860
0.38＜d≤0.61 Cold Drawing 1620~1825
0.61<d≤1.04; Bending Test Count ≥8 Cold Drawing 1620~1825
1.04<d≤1.19; Bending Test Count ≥8 Cold Drawing 1585~1790
1.19<d≤1.37; Bending Test Count ≥8 Cold Drawing 1550~1760
1.37<d≤1.57; Bending Test Count ≥7 Cold Drawing 1515~1725
1.57<d≤1.83; Bending Test Count ≥7 Cold Drawing 1480~1690
1.82<d≤2.03; Bending Test Count ≥7 Cold Drawing 1450~1655
2.03<d≤2.34; Bending Test Count ≥7 Cold Drawing 1415~1620
2.34<d≤2.67; Bending Test Count ≥5 Cold Drawing 1380~1585
2.67<d≤3.05; Bending Test Count ≥5 Cold Drawing 1345~1550
3.05<d≤3.76; Bending Test Count ≥3 Cold Drawing 1275~1480
3.76<d≤4.22; Bending Test Count ≥3 Cold Drawing 1240~1450
4.22<d≤4.5; Bending Test Count ≥3 Cold Drawing 1170~1380
4.5<d≤5.26; Bending Test Count ≥1 Cold Drawing 1105~1310
5.26<d≤5.72; Bending Test Count ≥1 Cold Drawing 1070~1275
5.72<d≤6.35; Bending Test Count ≥1 Cold Drawing 1035~1240
6.35<d≤7.92; Bending Test Count ≥1 Cold Drawing 965~1170
7.92<d≤9.53; Bending Test Count ≥1 Cold Drawing 930~1140
9.53＜d≤12.7 Cold Drawing 895~1105
d＞12.7 Cold Drawing 860~1070
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
06Cr18Ni11Ti S32168 321 SUS 321 STS 321 321 S32100 X6CrNiTi 18-10 4541-321-00-I X6CrNiTi 18-10
(X10CrNiTi 18-9) 		1.4541 Z6CNT 18-10 X6CrNiTi 18-10 1.4541 09Х18Н10Т
Х18Н10Т 		2337 321S12
321S31
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
06Cr18Ni11Ti
(0Cr18Ni11Ti) 		S32168 321 SUS 321 STS 321 321 S32100 X6CrNiTi 18-10 X6CrNiTi 18-10
(X10CrNiTi 18-9) 		1.4541 Z6CNT 18-10 X6CrNiTi 18-10 1.4541 09Х18Н10Т 2337 321S12
321S31
3 Approximate Comparison Table Austenitic Stainless Steel
China Japan United States Germany France European Standard Russia Sweden United Kingdom
GB JIS ASTM DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
0Cr18Ni10Ti
1Cr18Ni11Ti
H0Cr20Ni10Ti 		SUS321 321 X10CrNiTi18-9
X6CrNiTi18-10 		Z6CNT18-10 X6CrNiTi18-10 1.4541 08KH18N10T
08KH18N12T
12KH18N10T 		2337 321S31
4 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
5 Approximate Comparison Table Stainless Steels for Cold Heading and Cold Extruding
China Japan United States International Organization for Standardization European Standard
GB ISC JIS ASTM/AISI UNS ISO Numerical Grade EN Numerical Grade
06Cr18Ni11Ti
(0Cr18Ni11Ti) 		S32168 SUS321 321 S32100 X6CrNiTi18-10 4541-321-00-I X6CrNiTi18-10 1.4541
321 Corresponding Standards(Same grade name, different standards)
1 GB /T 20878-2007
321 06Cr18Ni11Ti S32168 (0Cr18Ni10Ti)
2 ASTM A959-2004
321 S32100
3 GB /T 1221-2007
321 06Cr18Ni11Ti S32168 (0Cr18Ni10Ti)
4 ASTM A193/A193M-2001
321 A193 B8T Class 1 S32100
5 ASTM A 276-2006
321 S32100
6 ASTM A240/240M-2018
321 S32100
7 SAE J405-1998
321 S32100
8 GB /T 1220-2007
321 06Cr18Ni11Ti S32168 (0Cr18Ni10Ti)
9 GB /T 4240-2019
321 06Cr18Ni11Ti S32168 (0Cr18Ni10Ti)
10 GB /T 4232-2019
321 ML06Cr18Ni11Ti S32168
11 SAE J467b-1956(R1968)
321
12 ASTM A276/A276M-2017
321 S32100
13 ASTM A193/A193M-2019
321 A193 B8T Class 1 S32100
14 ASTM A320/A320M-2018
321 A320 B8T Class 1 S32100
15 ASTM A473-2018
321 S32100
16 SAE J405-2018
321 S32100
17 ASTM A313/A313M-2018
321 S32100
18 ASTM A240/A240M-2020
321 S32100
19 ASTM A193/A193M-2020
321 A193 B8T Class 1 S32100
20 ASTM A959-2019
321 S32100
21 ASTM A320/A320M-2021
321 A320 B8T Class 1 S32100
22 Q/BQB 4302-2009
321 SUS 321
23 ASTM A479/A479M-2018
321 S32100
24 ASTM A194/A194M-2023
321 A194 Grade 8T S32100
25 ASTM A403/A403M-2022
321 WP321 S32100
26 Q/RP 007-2018
321
27 CNS 3477-2016
321
28 ASME SA-240/SA-240M-2023
321 S32100
29 ASTM A 314-2025
321 S32100
30 ASTM A 473-2024(a)
321 S32100
31 ASTM A193/A193M-2025
321 A193 B8T Class 1 S32100

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