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400 MPa-level tungstenic corrosion-resistant twisted steel and preparation method thereof

A threaded steel bar, 400mpa technology, applied in the field of alloy steel, can solve the problems of limited lifting, achieve simple operation, improve seawater corrosion resistance, good strength and plasticity

Inactive Publication Date: 2015-02-25
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In China, a small amount of elements such as Cu, P, Cr, Ni, Nb, V are added to improve the corrosion resistance of steel, but the improvement is relatively limited.

Method used

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  • 400 MPa-level tungstenic corrosion-resistant twisted steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The reinforcing bar of the present embodiment, each component is as shown in table 1, and its preparation method is:

[0025] The hot metal is desulfurized by the KR method to ensure that the sulfur content in the steel is controlled below 0.01%. Electric furnace smelting, using side blowing for decarburization and dephosphorization, smelting at 1655°C until the carbon content in molten steel is less than 0.05%, and the phosphorus content is less than 0.01%, tapping, adding ferrosilicon, Silicon-manganese alloy deoxidation, adding carbon powder and slagging material; after adding Cr alloy elements, use RH vacuum refining at 1625 °C to carry out oxygen blowing decarburization, and then use LF refining at 1595 °C to deoxidize until the oxygen content in molten steel is 0.002%, add W and other alloying elements after deoxidation; after refining, adopt protective casting, and continuously cast into 150mm×150mm billets; Single-strand rolling, the rolling specification is ∮2...

Embodiment 2

[0027] The reinforcing bar of the present embodiment, each component is as shown in table 1, and its preparation method is:

[0028] The hot metal is desulfurized by the KR method to ensure that the sulfur content in the steel is controlled below 0.01%. Electric furnace smelting, using side blowing for decarburization and dephosphorization, smelting at 1665°C until the carbon content in molten steel is less than 0.06%, and the phosphorus content is less than 0.01%, tapping, and adding ferrosilicon, Silicon-manganese alloy deoxidation, adding carbon powder and slagging material; after adding Cr alloy elements, use RH vacuum refining at 1635 °C to carry out oxygen blowing decarburization, and then use LF refining at 1605 °C to deoxidize until the oxygen content in molten steel is 0.002%, add W and other alloying elements after deoxidation; after refining, adopt protective casting, and continuously cast into 150mm×150mm billets; Single-strand rolling, the rolling specification i...

Embodiment 3

[0030] The reinforcing bar of the present embodiment, each component is as shown in table 1, and its preparation method is:

[0031] The hot metal is desulfurized by the KR method to ensure that the sulfur content in the steel is controlled below 0.01%. Electric furnace smelting, using side blowing for decarburization and dephosphorization, smelting at 1675°C until the carbon content in the molten steel is less than 0.06%, and the phosphorus content is less than 0.01%, tapping, adding ferrosilicon, Silicon-manganese alloy deoxidation, adding carbon powder and slagging material; after adding Cr alloy elements, use RH vacuum refining at 1645 °C to carry out oxygen blowing decarburization, and then use LF refining at 1615 °C to deoxidize until the oxygen content in molten steel is 0.002%, add W and other alloying elements after deoxidation; after refining, adopt protective casting, and continuously cast into 150mm×150mm billets; Single-strand rolling, the rolling specification is ...

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Abstract

The invention provides 400 MPa-level tungstenic corrosion-resistant twisted steel and a preparation method thereof. The twisted steel comprises the following components (wt%): 0.03%-0.05% of C, 0.3-0.6% of Si, 0.6-1.2% of Mn, smaller than or equal to 0.01% of P, smaller than or equal to 0.01% of S, 8.0-10.0% of Cr, 1.0-2.0% of W, one or a composition of 0.04-0.10% of V and 0.01-0.05% of RE and the balance of Fe and unavoidable impurities, wherein C, Si, Mn, P, S, Cr and W are basal components; and V and RE are optional components. The 400 MPa-level tungstenic corrosion-resistant twisted steel has the advantages that seawater corrosion resistance of the steel is improved by more than 4 times than that of common twisted steel, the performance is stable, structure mainly comprises ferrite and bainite, good strength and plasticity are ensured, and the 400 MPa-level tungstenic corrosion-resistant twisted steel can be widely applied to a reinforced concrete building structure in a marine environment.

Description

technical field [0001] The invention relates to the field of alloy steel, in particular to a 400MPa grade tungsten-containing corrosion-resistant threaded steel bar and a preparation method thereof. Background technique [0002] Coastal and marine structures such as sea-crossing bridges, breakwaters, trestles and harbor wharfs have long been in the harsh environment of seawater erosion. Therefore, the durability of marine concrete structures has become increasingly prominent, and reliable anti-corrosion measures should be taken. As the main structural material, steel bars are widely used in concrete structures, and their corrosion in seawater is an important factor for the corrosion of reinforced concrete structures. [0003] The seawater corrosion environment can be divided into five zones from the sea level down, namely, the marine atmosphere zone, the splash zone, the tidal range zone, the full immersion zone and the sea soil zone. Among them, the worst corrosion conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/24C22C33/04C21D8/08
Inventor 张建春麻晗李阳左龙飞
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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