ENGINEERING STEELS + ALLOYS
| Interlloy Grade | Nearest Related Specification | Typical Composition (%) & Properties | Description & Applications | ||||
| C | Ni | Cr | Mo | Other | |||
| Austenitic Stainless Steels | |||||||
| 303 | AS2837-1986-303 AISI TYPE 303 BS970-303 S31 & S42 ASTM A582/582M-303 |
0.15 MAX |
9.00 | 18.0 | 0.8 | 0.25 S | Free machining stainless, used where extensive machining is involved. |
| 304 | AS2837-1986-304 AISI TYPE 304 BS970-304 ASTM A276-304 |
0.08 MAX |
9.0 | 19.0 | Readily formed and welded stainless, used mainly in domestic, dairy and decorative appliances. |
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| 316 | AS2837-1986-316 AISI TYPE 316 BS970-316 S31 & S33 ASTM A276-316 |
0.08 MAX |
12.0 | 17.0 | 2.25 | For certain corrosive conditions particularly those involving Pit-type corrosion in the chemical and allied industries. |
|
| 316L | AS2837-1986-316L AISI TYPE 316L BS970-316 S11 & S13 ASTM A276-316L |
0.03 MAX |
12.0 | 17.0 | 2.25 | Low carbon version of 316 quality showing added resistance to weld decay. | |
| 321 | AS2837-1986-321 AISI TYPE 321 BS970-321 S31 ASTM A276-321 |
0.08 MAX |
10.0 | 18.0 | 0.50 Ti | Titanium stabilised weldable grade. Corrosion resistant and scaling resistant at temperatures up to 800oC. |
|
| Martensitic Stainless Steels | |||||||
| 410 | AS 2837-410 AISI TYPE 410 BS 970-410 S21 ASTM A276-410 |
.12 | .5 | 12.5 | A hardenable grade of stainless with good corosion resistance properties. | ||
| 416 | AS2837-1986-416 AISI TYPE 416 BS970-1991 416 ASTM A582-416 |
0.10 | 1.00 MAX |
12.5 | 0.6 MAX |
1.2 S | General engineering applications where free machining properties are required. Slightly inferior corrosion resistance to Type 410. |
| 420 | AS2837-1986-420 AISI TYPE 420 BS970-420 S29 ASTM A276-42000 |
0.25 | 1.00 MAX |
12.5 | General engineering applications such as pump and valve parts. | ||
| 420C | BS970: PART 3 1991-420 S37 ASTM A276-92-S420 S42010 |
0.30 | 1.00 MAX |
12.5 | Stainless developed to provide higher hardness after heat treatment. | ||
| 431 | AS2837-1986-431 AISI TYPE 431 BS970: PART 1 1983-431 S29 ASTM A276-431 |
0.18 | 2.20 | 16.0 | Hardenable steel with corrosion resistance approaching Type 302. Suited for pump shafts, or other uses where high tensile properties are required. |
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| 440C | AS2837-1986-440C AISI TYPE 440C ASTM A276-440C |
1.10 | 1.00 MAX |
17.0 | 0.75 MAX |
High carbon martensitic grade. High attainable hardness make it suitable to abrasion and wear resistance. |
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| Precipitation Hardened Stainless Steels | |||||||
| 630 17-4PH | AS2837-1986-630 AISI TYPE 630 ASTM A56/A564M-630 SAE J467 17-4PH UNS S17400 |
0.07 MAX |
4.00 | 16.00 | 3.70 Cu 0.25 Nb |
Martensitic age hardenable stainless. Good weldability and corrosion resistance comparable to 304. Suitable for pump shafts, boat shafts, valve stems etc. |
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| Duplex Stainless Steel | |||||||
| 2205 | ASTM-A276-98B UNS-S31803 W.NR 1.4462 DIN X 2 Cr Ni Mo N 22-5-3 |
0.03 MAX |
5.50 | 22.00 | 3.00 | 0.14 N | A ferritic/austenitic stainless steel providing an excellent combination of high yield strength and corrosion resistance. Better than 316 in most conditions. |
