High-performance plain round bar production process

A production process and technology for round steel bars, applied in the field of high-performance smooth round steel bars, can solve problems such as poor dimensional stability of steel, alloy costs, high rolling costs, and high quality risks, and achieve improved physical properties and excellent yield strength. , the effect of high precision improvement

Pending Publication Date: 2022-04-12
SHANDONG SHIHENG SPECIAL STEEL GROUP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The hot-rolled smooth round steel bar HPB300 for reinforced concrete, the current domestic process plan is: high temperature rolling, conventional process rolling, the composition standards are all within the upper limit of the national standard, the alloy cost and rolling cost are high, and the steel dimensional stability is poor , the size difference of the cleaning rod is 0.3-0.4mm, which is close to the upper limit of the national standard, and there is a large quality risk

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  • High-performance plain round bar production process

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Effect test

Embodiment 1

[0021] Rolled HPB300 high-performance smooth round steel bar Φ12mm:

[0022] Billet material includes the following elements by weight percentage: C: 0.21%, Si: 0.20%, Mn: 0.60%, S: 0.045%, P≤0.045%, the rest is Fe and unavoidable impurities;

[0023] Its production process adopts converter smelting, argon blowing at the bottom of the furnace, and billet continuous casting process to smelt billets that meet the above weight percentage element components; qualified billets enter the steel rolling heating furnace for heating, and the billet rolling temperature is 940 ° C. K1-K3 adopts rolling guides, roll K1 adopts double-row rolling guides, the gap between rolling guides is zero, and the small roll gap is between 1.5-2.5mm; the temperature of controlled rolling and controlled cooling is 900°C, and the finishing pass system The design scheme of small roll gap and single arc is adopted, and the mechanical properties and product size conform to the national standard GB / T1499.1. Th...

Embodiment 2

[0025] Rolled HPB300 high-performance smooth round steel bar Φ16mm:

[0026] Billet material includes the following elements by weight percentage: C: 0.25%, Si: 0.30%, Mn: 0.80%, S: 0.034%, P: 0.030%, the rest is Fe and unavoidable impurities;

[0027] Its production process adopts converter smelting, argon blowing at the bottom of the furnace, and billet continuous casting process to smelt billets that meet the above weight percentage element components; qualified billets enter the steel rolling heating furnace for heating, and the billet rolling temperature is 960 ° C. K1-K3 adopts rolling guides, roll K1 adopts double-row rolling guides, the gap between rolling guides is zero, and the small roll gap is between 1.5-2.5mm; the temperature of controlled rolling and controlled cooling is 920°C, and the finishing pass system The small roll gap and single arc design scheme are adopted to finally roll out the Φ16mm HPB300 high-performance smooth round steel bar whose mechanical pr...

Embodiment 3

[0029] Rolled HPB300 high-performance smooth round steel bar Φ18mm:

[0030] Billet material includes the following elements by weight percentage: C: 0.21%, Si: 0.20%, Mn: 0.70%, S: 0.036%, P: 0.035%, the rest is Fe and unavoidable impurities;

[0031] Its production process adopts converter smelting, argon blowing at the bottom of the furnace, and billet continuous casting process to smelt billets that meet the above weight percentage element components; qualified billets enter the steel rolling heating furnace for heating, and the billet rolling temperature is 980 ° C. K1-K3 adopts rolling guides, roll K1 adopts double-row rolling guides, the gap between rolling guides is zero, and the small roll gap is between 1.5-2.5mm; the temperature of controlled rolling and controlled cooling is 940°C, and the finishing pass system The small roll gap and single arc design scheme are adopted to finally roll out the Φ18mm HPB300 high-performance smooth round steel bar whose mechanical pr...

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Abstract

The invention discloses a high-performance plain round bar production process. A steel billet material comprises the following element components in percentage by weight: 0.21-0.25% of C, 0.20-0.40% of Si, 0.60-0.80% of Mn, less than or equal to 0.045% of S, less than or equal to 0.045% of P and the balance of Fe and inevitable impurities. Compared with a conventional process, the HPB300 plain round steel bar produced through the rolling guide and guard device has excellent yield strength, tensile strength, percentage elongation after fracture and total elongation under the maximum force; a full-process low-temperature rolling process is adopted, full-process control is carried out from the initial rolling temperature, the controlled rolling temperature and the controlled cooling temperature, and grain size refinement and physical property improvement are achieved; a small-roll-gap and single-arc design scheme is adopted for a finish rolling pass system, rolling guides are adopted for K1-K3, double-row rolling guides are adopted for K1, and guarantee is provided for high precision of round steel.

Description

technical field [0001] The invention relates to the technical field of metallurgy, and more specifically relates to a production process of high-performance smooth round steel bars. Background technique [0002] The hot-rolled smooth round steel bar HPB300 for reinforced concrete, the current domestic process plan is: high temperature rolling, conventional process rolling, the composition standards are all within the upper limit of the national standard, the alloy cost and rolling cost are high, and the steel dimensional stability is poor , The size difference of the cleaning rod is 0.3-0.4mm, which is close to the upper limit of the national standard, and there is a large quality risk. [0003] In order to reduce the production cost of hot-rolled smooth round steel bars for reinforced concrete and improve the dimensional accuracy of the steel, it is necessary to invent a high-performance smooth round steel bar production process to approach the above problems. Contents of...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C21D8/08C22C38/60B21B1/16B21B39/16
Inventor 王长生肖立军张忠峰马庆水李俊芳邓兆征郭其江孟丽军曹文强
Owner SHANDONG SHIHENG SPECIAL STEEL GROUP
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