Duplex stainless steel with excellent thermoplasticity and corrosion resistance and manufacturing method thereof

A technology of duplex stainless steel and a manufacturing method, applied in the field of duplex stainless steel, can solve the problem of difficult to avoid edge cracking during hot rolling, and achieve the effects of reducing adverse effects, improving thermoplasticity, good thermoplasticity and cold workability

Inactive Publication Date: 2013-07-17
BAOSTEEL STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] All of the above duplex stainless steel patents are either not specially designed for thermoplasticity, or although the thermoplasticity has been improved, it is still difficult to avoid the occurrence of hot-rolled edge cracks, and it is difficult to obtain high corrosion resistance and good thermal molding performance at the same time

Method used

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  • Duplex stainless steel with excellent thermoplasticity and corrosion resistance and manufacturing method thereof
  • Duplex stainless steel with excellent thermoplasticity and corrosion resistance and manufacturing method thereof
  • Duplex stainless steel with excellent thermoplasticity and corrosion resistance and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Take the production process of vacuum smelting - die casting - forging - hot rolling - annealing and pickling as an example: the raw materials are added to the vacuum smelting furnace for smelting, and the purity of the raw materials is strictly controlled to obtain the design components (as shown in Table 1); Pour it into a casting mold to obtain a 50Kg steel ingot, and the casting superheat degree is 20-50°C. The ingot is forged, the forging heating temperature is 1100-1250°C, and the thickness after forging is 40 mm. The forging billet was rolled on a reversing hot rolling mill with a heating temperature of 1100-1200° C., rolled to 4 mm, and the edge crack after hot rolling was measured. The hot-rolled sheet is annealed, the annealing temperature is controlled at 1020-1100°C, and the proportion of austenite in the structure after annealing is 40-60%, to obtain the duplex stainless steel with excellent thermoplasticity and corrosion resistance in this example.

[005...

Embodiment 2～8

[0062] The duplex stainless steels of Examples 2 to 8 were produced according to the production method of Example 1.

[0063] The alloy chemical composition of the duplex stainless steel in each example is shown in Table 1.

[0064] The duplex stainless steel material of each embodiment was tested for corrosion resistance, and its corrosion resistance was characterized by CPT (critical pitting temperature), and the measurement standard was ASTM G48-99.

[0065]Detect the duplex stainless steel of each embodiment to obtain the metallographic structure of the alloy of each embodiment: after the sample is ground and polished, electrolytic corrosion is carried out, and the corrosive agent is 40g KOH+100ml H 2 O, corrosion current 0.3~0.8A / cm 2 Finally, the proportion of austenite is analyzed by quantitative metallographic method under the metallographic microscope; the black structure is ferrite, the white structure is austenite, and the austenite phase accounts for 40-60%.

[0...

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Abstract

The present invention discloses a duplex stainless steel with excellent thermoplasticity and corrosion resistance and a manufacturing method thereof. The duplex stainless steel comprises chemical compositions of, by weight percentage, 0.01-0.06 % of C, 0.1-1.0 % of Si, 0.4-3.0 % of Mn, 17.5-20.5 % of Cr, 3.0-5.0 % of Ni, 0.1-0.18 % of N, 2.5-4.0 % of Mo,less than or equal to 0.005 % of S, less than or equal to 0.005 % B, less than or equal to 1.0 % of Cu, and the balance being Fe and inevitable impurities. According to the invention, a content of the Mo is increased to 2.5-4.0 %, a content of the Cr is reduced to 17.5-20.5 %, a content of the N is controlled at 0.1-0.18 %, and the trace elements S and B are also in control. The duplex stainless steel has excellent thermoplasticity and corrosion resistance, can be produced into hot-rolled and cold-rolled strip steels in mass and used in fields of construction, heat exchange, etc., and can partially replace costly 316 and 317 austenitic stainless steel.

Description

technical field [0001] The invention relates to the field of duplex stainless steel, in particular to a duplex stainless steel with excellent thermoplasticity and corrosion resistance and a manufacturing method thereof. Background technique [0002] After solution treatment, the duplex stainless steel consists of a dual phase of about 50% ferrite and 50% austenite at room temperature. The existence of the two-phase structure makes the duplex stainless steel have the characteristics of both ferritic stainless steel and austenitic stainless steel. Compared with austenitic stainless steel, the strength of duplex stainless steel, especially the yield strength, is significantly improved, and the resistance to intergranular corrosion, stress corrosion and wear resistance is significantly improved. Compared with ferritic stainless steel, its toughness is increased, brittle transition temperature is decreased, intergranular corrosion resistance and weldability are significantly imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/58C22C33/04C21D8/02
Inventor 胡锦程张伟宋红梅
Owner BAOSTEEL STAINLESS STEEL
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