Production method of steel S355NL for super-thick low-temperature wind towers
A production method and low-temperature technology, applied in temperature control, rolling mill control device, metal rolling, etc., to achieve low production cost, suitable for mass production, and short production process
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0022] A production method of extra-thick low-temperature wind tower steel S355NL, the technological process includes smelting, continuous casting billet, heating, dephosphorization, controlled rolling, controlled cooling, hot straightening, stacking and slow cooling, and thermal cutting to finished products. The specific process control is as follows:
[0023] 1) Smelting composition design (wt%): C: 0.17%, Si: 0.30%, Mn: 1.60%, Nb: 0.3%, V: 0.40%, Ti: 0.45%, Ni: 0.30%, P≤0.01%, S≤0.005%, the rest is iron and unavoidable trace impurities;
[0024] During smelting, the molten steel is first smelted in an electric furnace, and then sent to an LF refining furnace for refining. During the refining process, white slag formation is strengthened, and Ar gas blowing is strengthened to promote the mixing and stirring of molten steel and slag. After VD treatment, S is controlled below 0.005%. Ca treatment to improve the shape of inclusions;
[0025] 2) Casting: After the vacuum is br...
Embodiment 2
[0032] A production method of extra-thick low-temperature wind tower steel S355NL, the technological process includes smelting, continuous casting billet, heating, dephosphorization, controlled rolling, controlled cooling, hot straightening, stacking and slow cooling, and thermal cutting to finished products. The specific process control is as follows:
[0033] 1) Smelting composition design (wt%): C: 0.15%, Si: 0.45%, Mn: 1.40%, Nb: 0.3%, V: 0.40%, Ti: 0.45%, Ni: 0.30%, P≤0.01%, S≤0.003%, the rest is iron and unavoidable trace impurities;
[0034] During smelting, the molten steel is first smelted in an electric furnace, then sent to the LF refining furnace for refining, and then sent to the LF refining furnace for refining. The refining process strengthens the formation of white slag, strengthens the blowing of Ar gas to promote the mixing of molten steel and slag, and after VD treatment, the S is controlled. Below 0.003%, Ca treatment is carried out at the same time to imp...
Embodiment 3
[0042] A production method of extra-thick low-temperature wind tower steel S355NL, the technological process includes smelting, continuous casting billet, heating, dephosphorization, controlled rolling, controlled cooling, hot straightening, stacking and slow cooling, and thermal cutting to finished products. The specific process control is as follows:
[0043] 1) Smelting composition design (wt%): C: 0.18%, Si: 0.40%, Mn: 1.80%, Nb: 0.4%, V: 0.30%, Ti: 0.40%, Ni: 0.40%, P≤0.01%, S≤0.003%, the rest is iron and unavoidable trace impurities;
[0044]During smelting, the molten steel is first smelted in an electric furnace, and then sent to an LF refining furnace for refining. During the refining process, white slag is strengthened, and Ar gas blowing is strengthened to promote the mixing and stirring of molten steel and slag. After VD treatment, S is controlled below 0.003%. Ca treatment improves inclusion morphology.
[0045] 2) Casting: After the vacuum is broken, the contin...
PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More