Stainless Steel grades at a glance with ASTM specification and equivalent chart
Stainless steel is super common in many industries and homes nowadays because it fights off rust to a certain extent. How well it fights depends on the grade and type of steel, which is about what stuff it’s made of. All stainless steel has chromium and carbon, but the amounts change in different grades. These two things help it resist rust and stay strong. Other elements get added in to make it even stronger and better at resisting corrosion. Molybdenum is one of these, and it helps fight off certain types of corrosion. Stainless steel is used in lots of things we use every day, like cookware, surgical tools, and cutlery. It’s also big in piping, both at home and in big industries. In industry, you’ll find it in pipes, cladding materials, tanks, and containers. It’s strong, so the construction industry likes it too. There are different types of stainless steel, like austenitic, ferritic, martensitic, and duplex. Duplex is cool because it has the best of both ferritic and austenitic properties. The different types have different names, like hot rolled and annealed, cold rolled and passivated, bright annealed, and others. They’re given numbers so everyone can understand them the same way. If you need stainless steel for something, we’ve got all kinds in different shapes and sizes. Just ask us for a list of what we’ve got and how much it costs.
Stainless Steel Grades
- Austenitic stainless steel: 200 and 300 series
- Ferritic stainless steels means 400 series (contain 10% to 30% chromium content)
- Martensitic stainless steels : Its have 11 – 17% chromium with 0.15 – 0.63% carbon.
- Precipitation Hardening (PH) stainless steel: 17-7 PH® and PH 15-7 Mo®.
- NITRONIC® 19D, duplex 2205, Super Duplex 2507
Available Grades
SS 303 | Inox 303 | DIN 1.4305 | UNS S30300 | SUS 303 |
SS 304 | Inox 304 | DIN 1.4301 | UNS S30400 | SUS 304 |
SS 304L | Inox 304L | DIN 1.4307 | UNS S30403 | SUS 304L |
SS 304H | Inox 304H | DIN 1.4948 | UNS S30409 | SUS 304H |
SS 316 | Inox 316 | DIN 1.4401 | UNS S31600 | SUS 316 |
SS 316L | Inox 316L | DIN 1.4404 | UNS S31603 | SUS 316L |
SS 316H | Inox 316H | DIN 1.4919 | UNS S31609 | SUS 316H |
SS 316Ti | Inox 316Ti | DIN 1.4571 | UNS S31635 | SUS 316Ti |
SS 321 | Inox 321 | DIN 1.4541 | UNS S32100 | SUS 321 |
SS 321H | Inox 321H | DIN 1.4878 | UNS S32109 | SUS 321H |
SS 329 | Inox 329 | DIN 1.4460 | UNS S32900 | SUS 329 |
SS 347 | Inox 347 | DIN 1.4550 | UNS S34700 | SUS 347 |
SS 347H | Inox 347H | DIN 1.4961 | UNS S34709 | SUS 347H |
SS 310 | Inox 310 | DIN 1.4840 | UNS S31000 | SUS 310 |
SS 310S | Inox 310S | DIN 1.4845 | UNS S31008 | SUS 310S |
SS 317 | Inox 317 | DIN 1.4449 | UNS S31700 | SUS 317 |
SS 317L | Inox 317L | DIN 1.4438 | UNS S31703 | SUS 317L |
SS 314 | Inox 314 | DIN 1.4841 | UNS S31400 | SUS 314 |
SS 410 | Inox 410 | DIN 1.4006 | UNS S41000 | SUS 410 |
SS 416 | Inox 416 | DIN 1.4005 | UNS S41600 | SUS 416 |
SS 420 | Inox 420 | DIN 1.4021 | UNS S42000 | SUS 420 |
SS 430 | Inox 430 | DIN 1.4016 | UNS S43000 | SUS 430 |
SS 430F | Inox 430 | DIN 1.4104 | UNS S43020 | SUS 430 |
SS 431 | Inox 431 | DIN 1.4057 | UNS S43100 | SUS 431 |
SS 440C | Inox 440C | DIN 1.4125 | UNS S44004 | SUS 440C |
SS 446 | Inox 446 | DIN 1.4762 | UNS S44600 | SUS 446 |
SS 422 | Inox 422 | DIN 1.4742 | UNS S44200 | SUS 422 |
SS 904L | Inox 904L | DIN 1.4539 | UNS N08904 | SUS 904L |
17-4PH |
| DIN 1.4542 | UNS S17400 | SUS 630 |
15-5PH |
| DIN 1.4545 | UNS S15500 | XM-12 |
13-8PH |
| DIN 1.4534 | UNS S13800 |
|
Alloy A286 |
| DIN 1.4980 | UNS S66286 |
|
Alloy 660 |
|
| UNS S66286 | SUH 660 |
Nitronic 50 |
| DIN 1.3964 | UNS S20910 | XM-19 |
Nitronic 60 |
|
| UNS S21800 | Alloy 218 |
Stainless Steel Applications
- Martensitic stainless steels applications for the include cookwear, cutlery, springs etc.
- Austenitics steels mainly used in automotive trim, cookware, processing equipment, food and beverage equipment, and a variety of industrial applications.
- PH steels are in high demand by aerospace industries
- Used in heat exchangers, boilers, pressure vessels and tanks in chemical and oil and gas industries
Stainless Steel Types
Stainless steel is usually divided into 5 types:
- Ferritic
- Austenitic
- Martensitic
- Duplex
- Precipitation hardening (PH)
Stainless Steel Properties
Austenitic Grades
Grade | WNR No. | Tensile Strength (MPa) |
304 | 1.4301 | 540 – 750 |
304L | 1.4307 | 520 – 700 |
316 | 1.4401 | 520 – 670 |
316L | 1.4404 | 530 – 680 |
Ferritic Grades
Grade | WNR Number | Tensile Strength (MPa) | transverse Proof Strength 0.2% (MPa) | Longitudinal Proof Strength 0.2% (MPa) |
409 | 1.4512 | 380 – 560 | 220 | 210 |
430 | 1.4016 | 430 – 600 | 280 | 260 |
439 | 1.4510 | 420 – 600 | 240 | 230 |
4509 | 1.4509 | 430 – 630 | 250 | 230 |
Martensitic Grades
Grade | WNR Specification | Max Thickness (mm) |
420 | 1.4031 | 3.0 |
Stainless Steel Composition
Austenitic Grades
Grade | WNR Specification | Manganese (Mn) | Nickel (Ni) | Carbon (C) | Chromium (Cr) | Silicon (S) | Phosphorus (P) | Sulfur (S) | Molybdenum (Mo) | Nitrogen (N) | Iron (Fe) |
201 | 1.4372 | 5.5 – 7.5 | 3.5 – 5.5 | 0.15 | 16.0 – 18.0 | 1.00 | 0.045 | 0.015 | – | 0.05 – 0.25 | Balance |
301 | 1.4310 | 2.00 | 6.0 – 9.5 | 0.05 – 0.15 | 16.0 – 19.0 | 2.00 | 0.045 | 0.015 | 0.80 | 0.10 | Balance |
316 | 1.4401 | 2.00 | 10.0 – 13.0 | 0.07 | 16.5 – 18.5 | 1.00 | 0.045 | 0.015 | 2.0 – 2.5 | 0.1 | Balance |
316L | 1.4404 | 2.00 | 10.0 – 13.0 | 0.03 | 16.5 – 18.5 | 1.00 | 0.045 | 0.015 | 2.0 – 2.5 | 0.1 | Balance |
304 | 1.4301 | 2.00 | 8.0 – 10.5 | 0.07 | 17.5 – 19.5 | 1.00 | 0.045 | 0.015 | – | 0.1 | Balance |
304L | 1.4307 | 2.00 | 8.0 – 10.5 | 0.03 | 17.5 – 19.5 | 1.00 | 0.045 | 0.015 | – | 0.1 | Balance |
Ferritic Grades
Grade | EN No. | C | Si | P | S | Cr | Mn | Ni | Nb | Mo | Ti |
409 | 1.4512 | 0.030 | 1.00 | 0.040 | 0.015 | 10.5 – 12.5 | 1.00 | – | – | – | [6 x (C + N)] to max 0.65 |
430 | 1.4016 | 0.080 | 1.00 | 0.040 | 0.015 | 16.0 – 18.0 | 1.00 | – | – | – | – |
439 | 1.4510 | 0.050 | 1.00 | 0.040 | 0.015 | 16.0 – 18.0 | 1.00 | – | (3 x C + 0.3) to max 1 | – | [4 x (C + N) + 0.15] to max 0.8 |
434 | 1.4113 | 0.080 | 1.00 | 0.040 | 0.015 | 16.0 – 18.0 | 1.00 | – | – | – | – |
4509 | 1.4509 | 0.030 | 1.00 | 0.040 | 0.015 | 17.5 – 18.5 | 1.00 | – | – | – | 0.1 – 0.6 |
436 | 1.4513 | 0.025 | 1.00 | 0.040 | 0.015 | 16.0 – 18.0 | 1.00 | 0.020 | – | 0.80 – 1.40 | [4 x (C + N) + 0.15] to max 0.8 |
Martensitic Grades
Grade | Werkstoff nr | C | Cr | Mn | P | S | Ni | N | S | Fe |
410 | 1.4006 | 0.08 – 0.15 | 11.5 – 13.5 | 1.50 | 0.040 | 1.00 | 0.75 | – | 0.015 | Bal. |
420 | 1.4021 | 0.16 – 0.25 | 12.0 – 14.0 | 1.50 | 0.040 | 1.00 | – | – | 0.015 | Bal. |
420 | 1.4031 | 0.07 | 17.5 – 19.5 | 2.00 | 0.045 | 1.00 | 8.0 – 10.5 | 0.1 | 0.015 | Bal. |