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A method for producing annealing-free vanadium-containing heat-resistant steel hot-rolled wire rod

A technology of hot-rolled wire rod and heat-resistant steel, which is applied in the field of metallurgy to achieve good high-temperature durable strength, maintain high-temperature durable strength, and reduce the effect of segregation of alloy elements in billets

Active Publication Date: 2020-07-03
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are only some production processes and methods about supercritical vanadium-containing heat-resistant steel seamless pipes and plate welded pipes, which do not belong to the same technical field as annealing-free hot-rolled wire rods

Method used

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  • A method for producing annealing-free vanadium-containing heat-resistant steel hot-rolled wire rod
  • A method for producing annealing-free vanadium-containing heat-resistant steel hot-rolled wire rod
  • A method for producing annealing-free vanadium-containing heat-resistant steel hot-rolled wire rod

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Effect test

Embodiment 1

[0037] In this embodiment, the specification of annealing-free vanadium-containing heat-resistant steel hot-rolled wire rod is φ5.5mm, and its production method comprises the following steps:

[0038] (1) Through primary smelting in converter, LF refining, RH refining, and continuous casting process, a rectangular steel slab is made. The size of the end surface of the slab is 325mm*280mm. The chemical composition and mass percentage of the casting slab are: C: 0.11%, Si : 0.25%, Mn: 0.58%, P: 0.012%, S: 0.006%, Cr: 1.15%, Mo: 0.30%, and the rest are iron and unavoidable impurity elements; double slag smelting is used for the initial smelting of the converter, and the end point P is controlled : 0.005%; continuous casting adopts low superheat and dynamic soft reduction control process, superheat is 20°C, constant casting speed is 0.6m / min, inlet reduction rate is 0.512mm / m under soft reduction, and outlet reduction rate is 0.179 mm / m, slab center segregation is controlled at le...

Embodiment 2

[0048] In this embodiment, the annealing-free vanadium-containing heat-resistant steel hot-rolled wire rod specification is φ6.5mm, and its production method comprises the following steps:

[0049] (1) After preliminary smelting in converter, LF refining, RH refining, and continuous casting process, a rectangular steel slab is made. The size of the end face of the slab is 325mm*280mm. The chemical composition and mass percentage of the casting slab are: C: 0.12%, Si : 0.23%, Mn: 0.52%, P: 0.010%, S: 0.005%, Cr: 1.13%, Mo: 0.29%, and the rest are iron and unavoidable impurity elements; double slag smelting is used for the primary smelting of the converter, and the endpoint P is controlled : 0.006%; continuous casting adopts low superheat and dynamic soft reduction control technology, superheat is 30 ℃, constant casting speed is 0.6m / min, inlet reduction rate is 0.523mm / m under soft reduction, and outlet reduction rate is 0.186 mm / m, slab center segregation is controlled at leve...

Embodiment 3

[0059] In this embodiment, the annealing-free vanadium-containing heat-resistant steel hot-rolled wire rod specification is φ8.0mm, and its production method comprises the following steps:

[0060] (1) After preliminary smelting in converter, LF refining, RH refining, and continuous casting process, a rectangular steel slab is made. The size of the end face of the slab is 325mm*280mm. The chemical composition and mass percentage of the casting slab are: C: 0.12%, Si : 0.24%, Mn: 0.55%, P: 0.011%, S: 0.003%, Cr: 1.12%, Mo: 0.32%, and the rest are iron and unavoidable impurity elements; double slag smelting is used for the initial smelting of the converter, and the end point P is controlled : 0.007%; continuous casting adopts low superheat and dynamic soft reduction control process, superheat is 28 ℃, constant casting speed is 0.6m / min, inlet reduction rate is 0.527mm / m under soft reduction, and outlet reduction rate is 0.188 mm / m, slab center segregation is controlled at level ...

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Abstract

The invention provides a method for producing an annealing-free vanadium-containing heat-resistant steel hot-rolled wire rod. According to the method, a converter double-slag low-phosphorus-content control method is adopted to reduce direct cold forming cracking caused by localized enrichment of phosphides; a technology of dynamic soft reduction in continuous casting and long-term high-temperaturediffusion in a cogging process is adopted for effectively reducing segregation of alloying elements in a casting slab; a high-temperature oxidizing coatings is used for effectively avoiding the problem of difficult removal of composite oxide scales; low-temperature laying, low roller speed and other means for controlled rolling and controlled cooling are beneficial to phase transformation of austenite at a high temperature section to pearlite; and an off-line thermal-insulation cover can effectively reduce driving force of transformation of retained austenite to a martensite supercooled structure. The tensile strength of the vanadium-containing heat-resistant steel hot-rolled wire rod is 520-560 MPa, the structure is a combination of ferrite and pearlite, and a heat-resistant steel component directly processed by an annealing-free process by downstream users has good moldability and can maintain good high-temperature long-lasting strength when serving in a high-temperature environment.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing hot-rolled wire rods of annealing-free vanadium-containing heat-resistant steel. Background technique [0002] Due to its good high-temperature oxidation resistance and high creep rupture strength, heat-resistant steel is widely used in petroleum cracking pipe components, steam turbine blades, and turbine bolts. Alloying elements such as Cr, Mo, V, Nb, and Ti can precipitate dispersed second phase particles in the matrix, and fine grain and solid solution strengthening can effectively improve various high-temperature properties of the material. [0003] Due to the high content of hardenability elements and microalloying elements in heat-resistant steel, and because of the small size of the wire rod, the cooling rate after final rolling and spinning is fast, especially in the part where the central alloy element segregation is more serious, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C22C38/02C22C38/04C21D8/06
CPCC21D8/065C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/22
Inventor 许斌王利伟徐斌肖国华许海平卢巧婷肖振会鲁晓旭
Owner HANDAN IRON & STEEL GROUP
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