Japanese standard SD345 ribbed twisted 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, low cost, and the effect of reducing the precipitation temperature and brittle transition temperature

Inactive Publication Date: 2018-01-19
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 Japanese 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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  • Japanese standard SD345 ribbed twisted steel bar and production method thereof
  • Japanese standard SD345 ribbed twisted steel bar and production method thereof
  • Japanese standard SD345 ribbed twisted steel bar and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The specification of the daily standard SD345 steel bar in this embodiment is Φ22mm, and its chemical composition and mass percentage are shown in Table 1.

[0022] The production method of the daily standard SD345 steel bar of the present embodiment comprises steel billet heating, rolling and cooling process, and concrete process step is as follows:

[0023] (1) Heating process: the chemical composition and mass percentage of the steel billet are shown in Table 1, the soaking section temperature is 1105°C, the holding time is 52min; the furnace temperature is 1066°C;

[0024] (2) Rolling process: the steel billet is rolled after being descaled by high-pressure water, the rough rolling start temperature is 1031°C; the final rolling temperature is 1062°C;

[0025] (3) Cooling process: Light water cooling process is adopted, and the temperature of the cooling bed after cooling is 950°C.

[0026] The mechanical properties of the hot-rolled steel bars are shown in Table 2....

Embodiment 2

[0028] The specification of the daily standard SD345 steel bar in this embodiment is Φ32mm, and its chemical composition and mass percentage are shown in Table 1.

[0029] The production method of the daily standard SD345 steel bar of the present embodiment comprises steel billet heating, rolling and cooling process, and concrete process step is as follows:

[0030] (1) Heating process: the chemical composition and mass percentage of the billet are shown in Table 1, the temperature of the soaking section is 1095°C, the holding time is 54min; the temperature of the furnace is 1055°C;

[0031] (2) Rolling process: the steel billet is rolled after being descaled by high-pressure water, the rough rolling start temperature is 1030°C; the final rolling temperature is 1058°C;

[0032] (3) Cooling process: adopt the light-through water cooling process, and the temperature of the cooling bed after cooling is 945°C.

[0033] The mechanical properties of the hot-rolled steel bars are sh...

Embodiment 3

[0035] The specification of the daily standard SD345 steel bar in this example is Φ25mm, and its chemical composition and mass percentage are shown in Table 1.

[0036] The production method of the daily standard SD345 steel bar of the present embodiment comprises steel billet heating, rolling and cooling process, and concrete process step is as follows:

[0037] (1) Heating process: the chemical composition and mass percentage of the billet are shown in Table 1, the temperature of the soaking section is 1070°C, the holding time is 25min; the temperature of the furnace is 1030°C;

[0038] (2) Rolling process: the steel billet is rolled after descaling with high-pressure water, the rough rolling start temperature is 1010°C; the final rolling temperature is 970°C;

[0039] (3) Cooling process: Light water cooling process is adopted, and the temperature of the cooling bed after cooling is 1000°C.

[0040] The mechanical properties of the hot-rolled steel bars are shown in Table ...

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Abstract

The invention discloses a Japanese standard SD345 ribbed twisted steel bar and a production method thereof. The Japanese standard SD345 ribbed twisted steel bar comprises chemical components, by masspercent: 0.17%-0.21% of C, 0.15%-0.45% of Si, 0.80%-1.30% of Mn, 0.040% or less of P, 0.040% or less of S, 0.030%-0.060% of V, 0.30%-0.50% of Cr, 0.018%-0.025% of N, 0.20% or less of Mo, 0.20% or lessof Ni, 0.20% or less of Cu, and the balance Fe and unavoidable impurities. The production method comprises the working procedures of billet heating, rolling and cooling. According to the production method, alloying is carried out through low carbon and low manganese by adding vanadium, by cooperating with the reasonably designed heating temperature and the rolling and cooling control process, thepurpose of producing the Japanese standard SD345 ribbed twisted steel bar with qualified performance and excellent bending performance with low cost is achieved, and good economic and social benefitsare achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a daily standard SD345 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. SD345 is one of the grades of hot-rolled ribbed rebar with a characteristic yield strength of 345MPa in the Japanese JIS G 3112:2010 standard; the JIS G 3112:2010 standard clearly stipulates the composition, performance and external dimensions of SD345 steel bars . [0003] At present, due to insufficient utilization of V and N strengthening, unreasonable shape design of "bambo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C22C38/44C22C38/42C22C38/24C22C38/22C22C38/20C22C38/02C22C38/04C21D8/08
Inventor 梁均张春雷张俊粉王征王琪关大伟
Owner HEBEI IRON AND STEEL
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