Method for producing 65Mn hot rolled steel plate

A technology of hot-rolled steel sheet and production method, which is applied in the field of spring steel production, can solve the problems of high crack sensitivity, long heating time, decarburization on the surface of the cast slab, etc., and achieves uniform structure and properties, improved tensile strength, and improved yield strength. Effect

Inactive Publication Date: 2010-07-14
GUANGZHOU PEARL RIVER STEEL & IRON
2 Cites 23 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0002] 65Mn steel has the advantages of high hardness, good hardenability, less decarburization tendency, low price, good machinability, etc., but it is overheating sensitive, prone to quenching cracks, and temper brittle
[0004] The following main problems still exist in the existing technology of 65Mn hot-rolled steel plate development and production: due to the high carbon content of 65Mn, complex alloy composition, low casting speed of the thick slab continuous caster, and slow solidification of molten steel, it is easy to cause segregation and loosening of the cast slab composition, resulting in The structure of the final product is uneven; the casting slab is heat...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Abstract

The invention discloses a method for producing a 65Mn hot rolled steel plate, which comprises the steps of smelting, refining, thin slab casting, soaking, high pressure water descaling, hot continuous rolling, cooling and reeling based on the process of thin slab casting and rolling. The molten steel superheat temperature is T superheat (30 DEG C <T superheat </= 45 DEG C), the charging temperature of casting blanks is T charging (900 DEG C </= T charging </= 1050 DEG C), the final rolling temperature is T final (850 DEG C </= T final </= 950 DEG C), the reeling temperature is T reeling ( 550 DEG C </= T reeling </= 650 DEG C), the liquid core pressure of casting blanks is L pressure (2 </= L pressure </= 20mm), and the depth of a single-surface decarburized layer is 0.3 to 0.9 percent of the depth of the steel plate. The chemical constitutes of molten steel after being alloyed in a refining process comprise 0.62-0.70 wt.% of C, 0.17-0.37 wt.% of Si, 0.90-1.20 wt.% of Mn, less than or equal to 0.035 wt.% of P, less than or equal to 0.035 wt.% of S, less than or equal to 0.25 wt.% of Cr, less than or equal to 0.25 wt.% of Ni and the balance of Fe and inevitable impurities. The 65Mn hot rolled steel plate produced in the method has the characteristics of uniform structure property, high thermal stability and high strength, and the quality of the 65Mn hot-rolled steel plate is obviously improved.

Application Domain

Technology Topic

Continuous rollingSmelting +12

Image

  • Method for producing 65Mn hot rolled steel plate
  • Method for producing 65Mn hot rolled steel plate
  • Method for producing 65Mn hot rolled steel plate

Examples

  • Experimental program(5)

Example Embodiment

[0026] Example 1
[0027] Production of the 65Mn hot-rolled sheet of the present embodiment includes the following steps:
[0028] The process flow of thin slab continuous casting and rolling: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar cooling, coiling.
[0029] The chemical composition of the molten steel after refining is: C: 0.63wt.%, Si: 0.19wt.%, Mn: 0.97wt.%, P: 0.006wt.%, S: 0.012wt.%, Cr: 0.06wt.%, Ni: 0.08wt.%, the rest are Fe and inevitable impurities;
[0030] The process parameters of the thin slab continuous casting and rolling process are: molten steel superheat T 过 is 33℃, and the temperature of the billet entering the furnace is T 入 is 935℃, the finishing temperature T 终 is 860°C, the coiling temperature T 卷 635℃, continuous casting speed S 拉 is 3.6m/min.
[0031] The physical and chemical properties of mold slag: the melting point is 980-990℃, the basicity is 0.95, the viscosity is (1300℃) 0.95±0.1 poise, and the bulk density is 0.60±0.05Kg/L.
[0032] The microstructure of hot rolled steel sheet see figure 1 , and its properties are shown in Table 1.
[0033] Table 1 Properties of the 65Mn hot-rolled steel sheet of Example 1
[0034]

Example Embodiment

[0035] Example 2
[0036] Production of the 65Mn hot-rolled sheet of the present embodiment includes the following steps:
[0037] The process flow of thin slab continuous casting and rolling: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar cooling, coiling.
[0038] The chemical composition of the molten steel after refining is: C: 0.66wt.%, Si: 0.35wt.%, Mn: 1.10wt.%, P: 0.015wt.%, S≤0.007wt.%, Cr: 0.09wt.%, Ni: 0.07wt.%, the rest are Fe and inevitable impurities;
[0039] The process parameters of the thin slab continuous casting and rolling process are: molten steel superheat T 过 is 44°C, the billet entering the furnace temperature T 入 is 1030℃, the finishing temperature T 终 is 940°C, the coiling temperature T 卷 580℃, continuous casting speed S 拉 is 5.3m/min.
[0040] The physical and chemical properties of the mold slag used are as follows: the melting point is 960-970°C, the basicity is 0.89, the viscosity is (1300°C) 0.93±0.1 poise, and the bulk density is 0.60±0.10Kg/L.
[0041] The microstructure of hot rolled steel sheet see figure 2 , the performance is shown in Table 2.
[0042] Table 2 Properties of the 65Mn hot-rolled steel sheet of Example 2
[0043]

Example Embodiment

[0044] Example 3
[0045] Production of the 65Mn hot-rolled sheet of the present embodiment includes the following steps:
[0046] The process flow of thin slab continuous casting and rolling: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar cooling, coiling.
[0047] The chemical composition of the molten steel after refining is: C: 0.69wt.%, Si: 0.19wt.%, Mn: 0.99wt.%, P: 0.018wt.%, S: 0.009wt.%, Cr: 0.12wt.%, Ni≤0.08wt.%, the rest are Fe and inevitable impurities;
[0048] The process parameters of the thin slab continuous casting and rolling process are: molten steel superheat T 过 is 36℃, and the temperature of the billet entering the furnace is T 入 is 990℃, the finishing temperature T 终 is 890°C, the coiling temperature T 卷 560℃, continuous casting speed S 拉 is 4.5m/min.
[0049] The physical and chemical properties of mold slag: the melting point is 960-970℃, the basicity is 0.93, the viscosity is (1300℃) 0.96±0.12 poise, and the bulk density is 0.60±0.09Kg/L.
[0050] The microstructure of hot rolled steel sheet see image 3 , the performance is shown in Table 3.
[0051] Table 3 Properties of the 65Mn hot-rolled steel sheet of Example 3
[0052] Steel plate thickness
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Similar technology patents

Hydro-desulphurizing combined method

ActiveCN101412928AImprove product qualityIdeal comprehensive processing effectTreatment with hydrotreatment processesWaxChemistry
Owner:CHINA PETROLEUM & CHEM CORP +1

Classification and recommendation of technical efficacy words

  • Improve product quality
  • Uniform tissue performance

Mura phenomenon compensation method

Owner:TCL CHINA STAR OPTOELECTRONICS TECH CO LTD

Manufacturing method of high-strength and high-conductivity aluminum-magnesium-silicon alloy contact tube bus

ActiveCN105603268AUniform tissue performanceReduce the number of stretching passesManufacturing rigid-tube cablesMagnesiumHigh conductivity
Owner:湖北莲花电力母线制造有限公司

Method and device for monitoring inner wall temperature during surfacing of non-melting polar electric arc cylinder

InactiveCN109604773AConsistent depth of penetrationUniform tissue performanceWelding accessoriesWeld seamRobot control
Owner:NANJING UNIV OF SCI & TECH

Dislocation wire lap joint point device

InactiveCN104707875AUniform cooling speed and temperatureUniform tissue performanceWork treatment devicesMetal rolling arrangementsDislocationLap joint
Owner:CHONGQING MAITUO TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products