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Grade 321 / 321H Stainless Steel Sheet UNS S32100 overview
Grades 321 and 347 are the basic austenitic 18/8 steel (Grade 304) stabilized by Titanium (321) or Niobium (347) additions. These grades are used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850 °C. Grade 321 is the grade of choice for applications in the temperature range of up to about 900 °C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion
Grade 321H is a modification of 321 with higher carbon content, to provide improved high-temperature strength.
A limitation with 321 is that titanium does not transfer well across a high-temperature arc, so it is not recommended as a welding consumable. In this case grade 347 is preferred - the niobium performs the same carbide stabilization task but can be transferred across a welding arc. Grade 347 is, therefore, the standard consumable for welding 321. Grade 347 is only occasionally used as parent plate material.
Like other austenitic grades, 321 and 347 have excellent forming and welding characteristics, are readily brake or roll-formed and have outstanding welding characteristics. Post-weld annealing is not required. They also have excellent toughness, even down to cryogenic temperatures. Grade 321 does not polish well, so is not recommended for decorative applications.
Produc Forms : Sheet, plate , Coil , Strip .wire , Pipe, Tube ,Bar , Profile, Round, Flat, Square, Hexagonal
| Product Type | 321 Stainless Steel Sheet, 321 Stainless Steel Plate |
| Specification | ASTM A240 / ASME SA240 |
| Tolerances (width / thickness) | EN 10258/ DIN 59381) |
| EN 10151 ASTM A240 Grade 321 Strips | |
| EN 10088 A240 Tp 321 strips | |
| International Standard | ASTM A 480 |
| ASTM A 959 | |
| ASME IID | |
| EN ISO 9445 | |
| EN ISO 18286 | |
| EN 10051 | |
| EN 10088-1 | |
| ISO 15510 | |
| Dimensions | Cold rolled 321 Stainless Steel Plate 0.5-6.4 mm |
| Hot rolled 321 Stainless Steel Plate 3.0–10.0 mm | |
| Thickness | 0.1 to 100 mm Thk |
| Width | 10-2500mm |
| Length | 2m, 2.44m, 3m, or as required |
| Finish | SATIN, 2B, 2D, BA NO (8), Cold rolled sheet (CR), Hot rolled plate (HR), No.1 finish hot rolled, 1D, No.4, BA, 8K, hairline, brush, mirror etc. |
| Hardness | Soft, Hard, Half Hard, Quarter Hard, Spring Hard |
| Forms / Shapes | Plate, Sheet, Coils, Foils, Strip, Flats, Clad Plate, Plain Sheet, Rolling Sheet, Rolling Plate, Flat Shim, Flat Sheet, Shim Sheet, Rolls, Blank (Circle), sheared, annealed, soft annealed, descaled, tread plate, Checker Plate |
| Other Trade Name of 321 Stainless Sheet | SS 321, SUS 321, Inox 321, DIN 1.4541, UNS S32100, AISI 321, SAE 321 Sheet |
Some Normal specification at a glance
| | ASTM | JIS | AISI | EN |
| Grade | S30100 | SUS301 | 301 | 1.431 |
| S30400 | SUS304 | 304 | 1.4301 | |
| S30403 | - | 304L | 1.4307 | |
| S31008 | SUS310S | 310S | 1.4845 | |
| S31603 | - | 316L | 1.4404 | |
| S32100 | SUS321 | 321 | 1.4541 | |
| S41008 | SUS410S | 410S | - | |
| S43000 | SUS430 | 430 | 1.4016 | |
| S43932 | - | - | 1.451 | |
| S44400 | SUS444 | 444 | 1.4521 | |
| S44500 | SUS430J1L | - | - |
Dimension Ranges:
Width: 600mm~2030 mm
Thickness: 0.1~120.0 mm
Length: 300~6000 mm , Max 18000 mm
Surface Finish: No.1, 2B, BA, No.3, No.4, No.5, No.8, HL, Etching, SB, Ti-coating,color-coating ,embossing .
Typical applications include:
| AISI 321 equivalents | ||
| ASTM A182 Grade F321 | ASTM A580 Grade S32100 | SAE 321 |
| ASTM A193 Grade B8T Class 1 | ASTM A632 Grade TP321 | JIS SUS321 |
| ASTM A193 Grade B8T Class 2 | ASTM A774 Grade TP321 | JIS SUS321TPY |
| ASTM A193 Grade B8TA Class 1A | ASTM A778 Grade TP321 | JIS SUS321TP |
| ASTM A194 Grade 8T | ASTM A813 Grade TP321 | JIS SUS321TF |
| ASTM A194 Grade 8TA | ASTM A814 Grade TP321 | JIS SUS321TB |
| ASTM A213 Grade TP321 | ASTM A943 Grade TP321 | EN X6CrNiTi18-10 |
| ASTM A240 Grade S32100 | ASTM A959 Grade S32100 | EN 1.4541 |
| ASTM A249 Grade TP321 | ASTM A965 Grade F321 | GOST 06Ch18N10T |
| ASTM A269 Grade TP321 | ASTM F2281 Grade S32100 | GOST 08X18H10T |
| ASTM A276 Grade S32100 | ASTM F2281 Type II | GOST 12X18H10T |
| ASTM A312 Grade TP321 | ASTM F593 Grade S32100 | GB 0Cr18Ni11Ti |
| ASTM A313 Grade S32100 | ASTM F593 Grade Alloy Group 3 | UNS S32100 |
| ASTM A314 Grade S32100 | ASTM F594 Grade S32100 | DIN 1.4544 |
| ASTM A320 Grade B8T Class 1 | ASTM F594 Grade Alloy Group 3 | DIN 1.4544.9 |
| ASTM A320 Grade B8T Class 2 | ASTM F738M Grade S32100 | AFNOR 9160/C 63 |
| ASTM A320 Grade B8TA Class 1A | ASTM F738M Grade Alloy Group A2 | AFNOR 9160C201 |
| ASTM A336 Grade F321 | ASTM F836M Grade S32100 | AFNOR Z 10 CNT 18-11 |
| ASTM A336 Grade F321H | ASTM F836M Grade Alloy Group A4 | BS S524 |
| ASTM A358 Grade A240 Type 321 | DIN 1.4541 | BS S526 |
| ASTM A376 Grade TP321 | DIN X6CrNiTi18-10 | BS 2 S129 |
| ASTM A409 Grade TP321 | DIN X10CrNiMoTi18-10 | AISI S32100 |
| ASTM A473 Grade 321 | AFNOR Z6CNT18-10 | SAE S32100 |
| ASTM A479 Grade S32100 | BS 321S12 | EN FE-PA 13 |
| ASTM A511 Grade MT321 | BS 321S51 | EN 1.4544 |
| ASTM A554 Grade MT321 | UNI X6CrNiTi1811 | GOST 08Ch18N12T |
| UNE F.3523 | SS 2337 | JIS SUSF321 |
| UNE F.3553 | ||
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50 mm) min | Hardness | |
|---|---|---|---|---|---|
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 321 | 515 | 205 | 40 | 95 | 217 |
| 321H | 515 | 205 | 40 | 95 | 217 |
| 347 | 515 | 205 | 40 | 92 | 201 |
Physical Properties
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100 °C (J/kg.K) | Electrical Resistivity (nΩ.m) | |||
|---|---|---|---|---|---|---|---|---|---|
| 0-100 °C | 0-315 °C | 0-538 °C | at 100 °C | at 500 °C | |||||
| 321 | 8027 | 193 | 16.6 | 17.2 | 18.6 | 16.1 | 22.2 | 500 | 720 |
Approximate grade comparisons for 321 stainless sheets of steel are given in table 4.
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
|---|---|---|---|---|---|---|---|
| BS | En | No | Name | ||||
| 321 | S32100 | 321S31 | 58B, 58C | 1.4541 | X6CrNiTi18-10 | 2337 | SUS 321 |
| 321H | S32109 | 321S51 | - | 1.4878 | X10CrNiTi18-10 | - | SUS 321H |
| 347 | S34700 | 347S31 | 58G | 1.4550 | X6CrNiNb18-10 | 2338 | SUS 347 |
Possible alternative grades to grade 321 stainless sheets of steel are given Belows
| Grade | Why it might be chosen instead of 321 |
|---|---|
| 304L | The requirement is for resistance to intergranular corrosion, not for high-temperature strength |
| 3CR12 | Only a mild "high temperature" environment is present… up to about 600 °C. |
| 304H | Only a mild "high temperature" environment is present… up to about 800 °C. |
| 310 | The temperature of the operating environment is up to about 1100 °C - too high for 321 or 321H. |
| S30815 (253MA) | The temperature of the operating environment is up to about 1150 °C- too high for 321 or 321H. |
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