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Alloy Steel and Heat Treatment Process for Low Carbon Anchor Rod

A technology of alloy steel and heat treatment method, which is applied in the field of alloy steel and heat treatment process for low-carbon anchor rods, low-carbon alloy steel and its heat treatment process, and can solve the problem that it is difficult to obtain high strength and high plasticity, which restricts the development of anchor rod materials, comprehensive Poor mechanical properties and other problems, to achieve the effect of reducing the source of micro-cracks after welding, comprehensive mechanical properties at high normal temperature, and improving toughness

Inactive Publication Date: 2017-02-22
佛山市三水南钢实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

20MnSi and 25MnSi rebars are popularized and used now. The heat treatment process is quenching + high temperature tempering. The mechanical properties after heat treatment: tensile strength ≤ 850 MPa, yield strength ≤ 700 MPa, elongation ≤ 15%, This process has high heating temperature, high energy consumption, high production cost, poor comprehensive mechanical properties and difficulty in obtaining high strength and high plasticity, which seriously restricts the development of anchor materials in my country.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the alloy steel for low-carbon bolts provided in this embodiment, the steel contains the following components and their weight percentages: carbon: 0.21%, silicon: 0.95%, manganese: 1.15%, phosphorus: 0.012%, sulfur : 0.01:0%, titanium: 0.025%, vanadium: 0.015%, nickel; 0.02%, niobium: 0.02%, cobalt: 0.0035%, boron: 0.0055%, the rest is iron and unavoidable impurities; the impurities are by weight The percentage control is: oxygen: ≤0.0015%, nitrogen: ≤0.0080%, hydrogen: ≤0.0001%, arsenic: ≤0.012%, lead: ≤0.010%, tin: ≤0.010%, antimony: ≤0.010%.

[0035] The heat treatment method of alloy steel for low-carbon anchor rods in this embodiment includes hot forging→annealing→tempering→quenching and tempering heat treatment→cooling→surface strengthening heat treatment. Minutes, then the furnace is cooled to 350°C and kept for 19 minutes, and finally cooled to room temperature;

[0036] The tempering process: the tempering temperature is 780°C, and after reaching the tempe...

Embodiment 2

[0041] A low-carbon alloy steel for anchor bolts provided in this embodiment, the steel contains the following components and their weight percentages: carbon: 0.25%, silicon: 1.12%, manganese: 1.18%, phosphorus: 0.010%, sulfur : 0.011%, titanium: 0.025%, vanadium: 0.019%, nickel: 0.08%, niobium: 0.04%, cobalt: 0.0045%, boron: 0.0055%, the rest are iron and unavoidable impurities; the impurities are controlled by weight percentage For: oxygen: ≤0.0015%, nitrogen: ≤0.0080%, hydrogen: ≤0.0001%, arsenic: ≤0.012%, lead: ≤0.010%, tin: ≤0.010%, antimony: ≤0.010%.

[0042] The aforementioned heat treatment method for alloy steel for low-carbon anchor rods includes hot forging → annealing → tempering → quenching and tempering heat treatment → cooling → surface strengthening heat treatment, the annealing process: after hot forging, heat to 870 ° C for 28 minutes, Then the furnace was cooled to 360°C and kept for 18 minutes, and finally cooled to room temperature;

[0043] The temperin...

Embodiment 3

[0048] In the alloy steel for low-carbon bolt provided in this embodiment, the composition and weight percentage contained in the steel are as follows: the composition and weight percentage contained in the steel are: carbon: 0.27%, silicon: 1.25%, manganese: 1.35%, phosphorus: 0.015%, sulfur: 0.015%, titanium: 0.030%, vanadium: 0.022%, nickel: 0.12%, niobium: 0.05%, cobalt: 0.0055%, boron: 0.0065%, and the rest are Iron and unavoidable impurities; said impurities are controlled by weight percentage: oxygen: ≤0.0015%, nitrogen: ≤0.0080%, hydrogen: ≤0.0001%, arsenic: ≤0.012%, lead: ≤0.010%, tin: ≤0.010 %, antimony: ≤0.010%.

[0049] The aforementioned heat treatment method for alloy steel for low-carbon anchor rods includes hot forging → annealing → tempering → quenching and tempering heat treatment → cooling → surface strengthening heat treatment, the annealing process: after hot forging, heat to 890 ° C for 25 minutes, Then the furnace was cooled to 380°C and kept for 15 min...

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Abstract

The invention relates to low-carbon alloy steel for an anchor rod. The steel is prepared from the following ingredients in percentage by weight: 0.21-0.27% of carbon, 0.95-1.25% of silicon, 1.15-1.35% of manganese, less than or equal to 0.015% of phosphorus, less than or equal to 0.015% of sulfur, 0.025-0.030% of titanium, 0.015-0.022% of vanadium, 0.02-0.12% of nickel, 0.02-0.05% of niobium, 0.0035-0.0055% of cobalt, 0.0055-0.0065% of boron and the balance of iron and inevitable impurities. A great amount of fine, dispersed and distributed compound inclusions of titaniferous oxide and nitride can be generated through control of production process condition; the steel can contain a great amount of fine, dispersed and distributed compound inclusions of titaniferous oxide, nitride and the like, and the inclusions can increase the phase change nucleation positions of ferrite and pearlite in a cooling process after steel tempering, so that the structure of the steel from surface to center is uniform and the difficult problems that the traditional steel has high energy consumption and high production cost are solved.

Description

technical field [0001] The invention relates to a low-carbon alloy steel and a heat treatment process thereof, in particular to an alloy steel for a low-carbon anchor rod and a heat treatment process thereof, and belongs to the technical field of metal smelting and its heat treatment process. Background technique [0002] Anchor refers to drilling a rock hole, then pouring cement mortar into the rock hole and inserting a piece of steel. When the mortar solidifies and hardens, the steel is anchored in the surrounding rock. With the help of this anchoring, the steel in the surrounding rock can effectively To control the deformation of the surrounding rock or shallow rock mass and prevent it from sliding and collapsing, the steel that is inserted into the rock hole and anchored in the surrounding rock so that the surrounding rock or the upper rock mass acts as a support is called a bolt. [0003] With the continuous increase of coal mining depth, roadway support is becoming mor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/60C21D6/00
Inventor 梁森仲
Owner 佛山市三水南钢实业有限公司