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Hot rolled steel, manufacturing method of hot rolled steel, mooring cable and manufacturing method of mooring cable

A manufacturing method and hot-rolled steel technology, which are applied to ships and other directions, can solve the problems of high energy consumption and high cost, and achieve the effect of saving production costs and reducing energy consumption.

Active Publication Date: 2017-10-31
NEW FOUNDER HLDG DEV LLC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hot-rolled steel and its manufacturing method, mooring chain and its manufacturing method, to solve the problem of high cost and high energy consumption of the hot-rolled steel manufacturing method in the prior art

Method used

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  • Hot rolled steel, manufacturing method of hot rolled steel, mooring cable and manufacturing method of mooring cable
  • Hot rolled steel, manufacturing method of hot rolled steel, mooring cable and manufacturing method of mooring cable
  • Hot rolled steel, manufacturing method of hot rolled steel, mooring cable and manufacturing method of mooring cable

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Embodiment 1

[0045] The process route for manufacturing hot-rolled steel provided by the present invention includes the following steps: FAF (electric furnace steelmaking) → LF refining (ladle refining) → VD refining (vacuum refining) → continuous casting → cutting → cooling (slow cooling) → inspection → judgment →heating→rolling→cutting→air cooling→ultrasonic + magnetic particle inspection→(finishing)→judgment→packaging→weighing→storage. The main steps in the above steps are described below.

[0046] Such as figure 1 As shown, the manufacturing method of the hot-rolled steel provided by Embodiment 1 of the present invention includes:

[0047] Step 11: melting raw materials into molten steel and tapping;

[0048] The raw materials include main materials and auxiliary materials. The main materials include pig iron and steel scrap. Of course, pig iron can also be replaced by molten iron, or pig iron and molten iron can be added at the same time. Pig iron and molten iron should meet the re...

Embodiment 2

[0108] In order to better solve the above technical problems, Embodiment 2 of the present invention provides a hot-rolled steel, which contains 0.20% to 0.35% by weight of vanadium, 0.020% to 0.030% of titanium and 0.015% ~0.020% nitrogen.

[0109] Of course, the hot-rolled steel also includes: 0.30%-0.50% chromium, 0.20%-0.50% nickel and 0.20%-0.30% molybdenum.

[0110] It can be seen that the proportion of precious metal elements such as chromium, molybdenum, nickel, niobium and titanium is smaller than that of existing hot-rolled steel, which greatly reduces the production cost.

[0111] The hot-rolled steel also includes: 0.27%-0.34% carbon by weight, 0.17%-0.37% silicon, 1.40%-1.80% manganese, 0.020%-0.065% aluminum, and 0.00%-0.20% copper , 0.000% to 0.025% of phosphorus, 0.000% to 0.015% of sulfur, 0.0000% to 0.0015% of oxygen, 0.00000% to 0.00020% of hydrogen, and the balance is iron.

[0112] The hot-rolled steel with this chemical composition and content has high s...

Embodiment 3

[0117] Correspondingly, Embodiment 3 of the present invention provides a method for manufacturing a mooring chain, such as image 3 shown, including:

[0118] Step 31: flash welding the hot-rolled steel;

[0119] Step 32: air-cool the welded hot-rolled steel to obtain a mooring chain;

[0120] Wherein, the hot-rolled steel contains 0.20% to 0.35% of vanadium, 0.020% to 0.030% of titanium and 0.015% to 0.020% of nitrogen by weight.

[0121] The mooring chain manufacturing method provided by Embodiment 3 of the present invention not only ensures the strength of the mooring chain, but also cancels the heat treatment process in the chain manufacturing process, reduces energy consumption, and saves production costs.

[0122] Specifically, the step of performing flash welding on the hot-rolled steel includes: performing flash welding on the hot-rolled steel at a temperature of 800°C to 950°C.

[0123] It can also be said that the manufacturing method of the mooring chain provided...

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Abstract

The invention provides hot rolled steel, a manufacturing method of the hot rolled steel, a mooring cable and a manufacturing method of the mooring cable. The manufacturing method of the hot rolled steel comprises the steps that raw materials are melted into molten steel, and steel tapping is conducted; the molten steel is refined, constituents of the molten steel are slightly adjusted, and accordingly, the refined molten steel comprises, by weight, 0.20-0.35% of vanadium, 0.020-0.030% of titanium and 0.015-0.020% of nitrogen; the refined molten steel is cast into a cast blank; and the cast blank is rolled and air-cooled into the hot rolled steel. According to the scheme provided by the invention, microalloying (V, Ti and the combination element N of V and Ti are added ) is conducted during steel smelting production, the finish rolling temperature is controlled in the steel rolling process, thus, the precipitation amount of VN and Ti3N4 in the grain boundary and primary-precipitated ferrite is controlled, the purposes of grain boundary strengthening and dispersion strengthening are achieved, and the hot rolled steel with the toughness being identical to that of steel which comprises a large quantity of alloy elements and is subjected to tempering treatment is obtained; and in addition, heat treatment does not need to be conducted in the manufacturing process, the production cost is greatly reduced, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a hot-rolled steel and a manufacturing method thereof, a mooring chain and a manufacturing method thereof. Background technique [0002] Steel for R4 marine mooring chains The hot-rolled round steel for third-grade anchor chains is a kind of steel commonly used in the shipbuilding industry. The currently used R4 marine mooring chain hot-rolled round steel requires the strength and toughness after quenching and tempering to meet the following requirements, such as yield strength (σ s ) is 580Mpa, the tensile strength (σ b ) is 860Mpa, the elongation (δ) is 12%, the reduction of area (ψ) is 50%, and the average impact energy of the V-notch at the center position is 50J at -20°C. In order to meet the high strength and toughness requirements of hot-rolled round steel for R4 mooring chains, in the manufacturing process, higher alloy content is usually used, such as: Cr content 0....

Claims

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Application Information

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IPC IPC(8): C21D8/06C22C38/12C22C38/14C22C38/18C22C38/08C22C38/02C22C38/04C22C38/06C22C38/16B63B21/20
CPCB63B21/20B63B2021/203B63B2231/04C21D8/06C22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 石新华
Owner NEW FOUNDER HLDG DEV LLC
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