JPS57161024A - Heat treatment of low carbon steel - Google Patents
Heat treatment of low carbon steelInfo
- Publication number
- JPS57161024A JPS57161024A JP4651181A JP4651181A JPS57161024A JP S57161024 A JPS57161024 A JP S57161024A JP 4651181 A JP4651181 A JP 4651181A JP 4651181 A JP4651181 A JP 4651181A JP S57161024 A JPS57161024 A JP S57161024A
- Authority
- JP
- Japan
- Prior art keywords
- temp
- low carbon
- carbon steel
- transformation
- heated
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
PURPOSE:To lower the hardness of the low carbon steel heated to above its austenitizing temp. through spheroidization of deposited carbide by cooling said steel from its A1 transformation temp. down to prescribed temp., thence heating the same to the temps. lower by a prescribed temp. range than the A1 transformation temp. and holding it at these temps. CONSTITUTION:Low carbon steel of <=0.3wt% of content of C is heated to temp. higher by 50-300 deg.C than the A3 transformation temp., that is, austenizing temp. Next, the low carbon steel after the heating is cooled down to the temp. lower by 50 deg.C than the A1 transformation temp. at about 20-50 deg.C/hr cooling rates. Thence, the low carbon steel after the deposition of carbide is heated and held at the temp. range lower by 5-50 deg.C than the A1 transformation temp. whereby carbide is aggregated and spheroidized gradually. The heating and holding time of this case is satisfactory if it is 30min or about 1hr with the steel of about 25mm. wall thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4651181A JPS57161024A (en) | 1981-03-31 | 1981-03-31 | Heat treatment of low carbon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4651181A JPS57161024A (en) | 1981-03-31 | 1981-03-31 | Heat treatment of low carbon steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57161024A true JPS57161024A (en) | 1982-10-04 |
Family
ID=12749278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4651181A Pending JPS57161024A (en) | 1981-03-31 | 1981-03-31 | Heat treatment of low carbon steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57161024A (en) |
-
1981
- 1981-03-31 JP JP4651181A patent/JPS57161024A/en active Pending
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