GB782172A - Improvements relating to martensitic stainless steels - Google Patents
Improvements relating to martensitic stainless steelsInfo
- Publication number
- GB782172A GB782172A GB2118154A GB2118154A GB782172A GB 782172 A GB782172 A GB 782172A GB 2118154 A GB2118154 A GB 2118154A GB 2118154 A GB2118154 A GB 2118154A GB 782172 A GB782172 A GB 782172A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- steel
- exceeding
- hours
- content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
Abstract
A weldable, high tensile, corrosion-resistant martensitic steel consists of 0.03-0.10 per cent C; over 16 per cent and up to 18 per cent Cr; 3-6 per cent Ni; 0.30 to 1.20 per cent Nb (including residual Ta) or Ti, the amount in the case of Nb being greater than 8 times the C content and in the case of Ti being greater than 5 times the C content; Si and Mn each 1 per cent maximum; free from Mo, Cu, Al or containing only residual amounts not exceeding 0.2 per cent each; S and P up to 0.4 per cent each; N not exceeding 0.1 per cent; and the remainder Fe apart from usual impurities associated with steel manufacture. A preferred steel has 0.7 per cent Nb, 0.08 per cent C, 17 per cent Cr, 5 per cent Ni. The heat treatment preferred consists of hardening for 2 hours at 950 DEG C., air cooling uniformly to room temperature, followed by tempering or stress relieving at 300-650 DEG C. (preferably heating between 550-600 DEG C. for 2-6 hours) and air cooling. In certain cases the 950 DEG C. treatment may be omitted, the hot worked articles being simply stress annealed at 550-600 DEG C. and cooled in air or in the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2118154A GB782172A (en) | 1954-07-20 | 1954-07-20 | Improvements relating to martensitic stainless steels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2118154A GB782172A (en) | 1954-07-20 | 1954-07-20 | Improvements relating to martensitic stainless steels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB782172A true GB782172A (en) | 1957-09-04 |
Family
ID=10158541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2118154A Expired GB782172A (en) | 1954-07-20 | 1954-07-20 | Improvements relating to martensitic stainless steels |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB782172A (en) |
-
1954
- 1954-07-20 GB GB2118154A patent/GB782172A/en not_active Expired
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