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Korean standard SD400 ribbed threaded steel bar and production method thereof

A threaded steel bar and production method technology, applied in the field of metallurgy, can solve the problems that the shape of "bamboo ribs" is difficult to meet the standard requirements, the shape design of "bamboo ribs" is unreasonable, and the strengthening and utilization are not sufficient, so as to achieve good economic and social benefits. Benefits, reduced production costs, and excellent bending properties

Inactive Publication Date: 2017-05-31
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, due to insufficient utilization of V and N strengthening, unreasonable shape design of "bamboo ribs", strict requirements on mechanical performance indicators such as yield strength, and strict requirements on bending performance, the production of Korean standard steel bars has high production costs and "bamboo ribs" "The shape is not easy to meet the standard requirements and the bending performance is poor

Method used

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  • Korean standard SD400 ribbed threaded steel bar and production method thereof
  • Korean standard SD400 ribbed threaded steel bar and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This Korean standard SD400 steel bar is prepared by the following specific process, and the rolling specification is Φ10mm.

[0033] Put the steel billet into a heating furnace with a temperature of 1105-1135° C. in the soaking section and heat it. The holding time in the soaking section is 32 minutes, so that the steel billet reaches 1066° C. before being released from the furnace. After the heated billet is descaled by high-pressure water, rough rolling, intermediate rolling and finishing rolling are carried out. The starting temperature of rough rolling is 1031°C; the final rolling temperature is 1062°C; The mechanical properties of the hot-rolled steel bar obtained in this embodiment are shown in Table 2.

Embodiment 2

[0035] This Korean standard SD400 steel bar is prepared by the following specific process, and the rolling specification is Φ22mm.

[0036] Put the billet into a heating furnace with a temperature of 1100-1130° C. in the soaking section and heat it. The holding time in the soaking section is 30 minutes, so that the billet reaches 1062° C. before being released from the furnace. After the heated billet is descaled by high-pressure water, rough rolling, intermediate rolling and finishing rolling are carried out. The starting temperature of rough rolling is 1030°C; the final rolling temperature is 1060°C; The mechanical properties of the hot-rolled steel bar obtained in this embodiment are shown in Table 2.

Embodiment 3

[0038] This Korean standard SD400 steel bar is prepared by the following specific process, and the rolling specification is Φ32mm.

[0039] Put the steel billet into a heating furnace with a temperature of 1095-1125° C. in the soaking section and heat it. The holding time in the soaking section is 28 minutes, so that the steel billet reaches 1055° C. before being released from the furnace. The heated slab is descaled by high-pressure water and then subjected to rough, medium and finish rolling. The starting temperature of rough rolling is 1028°C; the temperature of final rolling is 1058°C; The mechanical properties of the hot-rolled steel bar obtained in this embodiment are shown in Table 2.

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Abstract

The invention discloses a Korean standard SD400 ribbed threaded steel bar and a production method thereof. The steel bar comprises the chemical components of, by mass, 0.17-0.25% of C, 0.20-0.50% of Si, 0.80-1.30% of Mn, no larger than 0.045% of P, no larger than 0.045% of S, 0.030-0.060% of V, 0.30-0.50% of Cr, 0.018-0.025% of N, no larger than 0.20% of Mo, no larger than 0.20% of Ni, no larger than 0.20% of Cu, and the balance Fe and inevitable impurities. The production method comprises the procedures of heating, rough rolling, medium rolling, finish rolling and cooling. According to the production method, the Korean standard SD400 ribbed threaded steel bar which is produced at low cost and has qualified performance and excellent bending performance is achieved by adding vanadium into low carbon and low manganese for alloying in cooperation with the reasonably designed heating temperature and controlled rolling and controlled cooling process and has good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a Korean standard SD400 ribbed threaded steel bar and a production method thereof. Background technique [0002] Hot-rolled steel bars are the main reinforcement materials for reinforced concrete building structures. With the emergence of multi-functional building structures such as high-rise, long-span, earthquake-resistant, low-temperature resistant, and fire-resistant, steel bars are required to have higher strength, toughness, and better weldability. and other comprehensive performance. SD400 is one of the grades of hot-rolled ribbed rebar with a characteristic yield strength of 400MPa in the Korean KS D 3504:2011 standard; the KS D 3504:2011 standard clearly stipulates the composition, performance and external dimensions of SD400 steel bars . [0003] At present, due to insufficient utilization of V and N strengthening, unreasonable shape design of "bamboo r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/42C22C38/44C22C38/46C22C38/02C21D8/08E04C5/03
CPCC22C38/04C21D8/08C22C38/001C22C38/002C22C38/02C22C38/42C22C38/44C22C38/46E04C5/03
Inventor 梁均张俊粉韩春良张春雷王井伟关大伟
Owner HEBEI IRON AND STEEL
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