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Annealing process of martensitic stainless steel cold-rolled strip steel for tool

A martensitic stainless steel and cold-rolled strip technology, applied in the field of stainless steel processing, can solve the problems of complex equipment, long production lines, and easily broken belts, and achieve the effects of simple production methods, low equipment costs, and small footprint

Inactive Publication Date: 2018-02-09
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an annealing process of martensitic stainless steel cold-rolled strip steel for cutting tools, so as to solve the problem that the existing process is easy to break, easy to be oxidized, uneven scale, easy to produce oxygen residue, poor pickling, and color difference And the surface is rough, the annealing raw materials pollute the environment, the cost is high, and the equipment is complicated, the production line is long, and the problem of easy scratches

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: a kind of annealing process of martensitic stainless steel cold-rolled steel strip for cutter, comprises the steps:

[0041] Step 1. Raw material hot rolling:

[0042] Hot-rolled pure steel slabs to a thickness of 3.0mm;

[0043] Step 2, hot rolling annealing:

[0044] The hot-rolled black coil is annealed at 840°C for bell annealing, and the holding time is 12h;

[0045] Step 3, hot-line pickling:

[0046] The continuous pickling process of scale breaking-shot blasting-sulfuric acid pre-pickling-mixed acid pickling is used to pickle the stainless steel coil, the concentration of HF in the mixed acid pickling stage is 5g / l, HNO 3 Concentration 30g / l, metal ion concentration below 50g / l;

[0047] Step four, rolling:

[0048] Roll the steel coil obtained in step 3 through a 20-roll mill for 2 passes to a target thickness of 2.0mm, and the rolling reduction is controlled at 15%;

[0049] Step five, degreasing:

[0050] The steel coil obtained in step 4...

Embodiment 2

[0058]Embodiment 2: a kind of annealing process of martensitic stainless steel cold-rolled steel strip for cutter, comprises the steps:

[0059] Step 1. Raw material hot rolling:

[0060] Hot-rolled pure steel slabs to a thickness of 6.0mm;

[0061] Step 2, hot rolling annealing:

[0062] The hot-rolled black coil is annealed at 860°C for bell annealing, and the holding time is 16h;

[0063] Step 3, hot-line pickling:

[0064] The continuous pickling process of scale breaking-shot blasting-sulfuric acid pre-pickling-mixed acid pickling is used to pickle the stainless steel coil, the concentration of HF in the mixed acid pickling stage is 15g / l, HNO 3 Concentration 70g / l, metal ion concentration below 50g / l;

[0065] Step four, rolling:

[0066] Roll the steel coil obtained in step 3 through a 20-roll rolling mill for 5 passes to a target thickness of 2.0mm, and the rolling reduction rate is controlled at 45%;

[0067] Step five, degreasing:

[0068] The steel coil obtai...

Embodiment 3

[0076] Embodiment 3: a kind of annealing process of martensitic stainless steel cold-rolled steel strip for cutter, comprises the steps:

[0077] Step 1. Raw material hot rolling:

[0078] Hot-rolled pure steel slabs to a thickness of 3.5mm;

[0079] Step 2, hot rolling annealing:

[0080] The hot-rolled black coil is annealed at 850°C for bell annealing, and the holding time is 14h;

[0081] Step 3, hot-line pickling:

[0082] The continuous pickling process of scale breaking-shot blasting-sulfuric acid pre-pickling-mixed acid pickling is used to pickle the stainless steel coil, the concentration of HF in the mixed acid pickling stage is 10g / l, HNO 3 Concentration 50g / l, metal ion concentration below 50g / l;

[0083] Step four, rolling:

[0084] The steel coil obtained in step 3 is rolled 3 times through a 20-roll rolling mill to the target thickness, and the rolling reduction rate is controlled at 30%;

[0085] Step five, degreasing:

[0086] The steel coil obtained in...

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Abstract

The invention discloses an annealing process of martensitic stainless steel cold-rolled strip steel for a tool, and belongs to the technical field of stainless steel machining. The problems that according to existing processes, strip breaking and oxidization are prone to occurring, oxide skins are uneven, the phenomena of oxidized residues, poor pickling, color difference and rough surfaces are prone to occurring, annealing raw materials pollute the environment and are high in cost, moreover, equipment is complex, the production line is long, and scratching is prone to occurring are solved. The annealing process comprises the following steps of raw material hot rolling, hot rolling annealing, hot line pickling, rolling, bell type annealing, and cutting and packaging. According to the annealing process, compared with common 2D production equipment, a bell type annealing furnace is simple in equipment, small in occupied area, low in equipment cost and easy to operate, a production methodis simple and easy to implement, manufactured strip steel is bright in surface, high in plasticity, toughness and quenching hardness, slitting machining, forming machining, surface machining and surface grinding are facilitated, and the tool with a small specification can be rolled and produced conveniently.

Description

technical field [0001] The invention belongs to the technical field of stainless steel processing, and in particular relates to an annealing process for a martensitic stainless steel cold-rolled strip for cutting tools. Background technique [0002] The surface quality of stainless steel cold-rolled strip is the main feature of the continuous upgrading of modern product quality. In recent years, due to the advancement of production technology and the promotion of market demand, the surface quality of martensitic stainless cold-rolled strip products is still developing, especially the stability and uniformity of the strip surface are more prominent. The main supply surfaces of martensitic stainless steel for general cutting tools include black skin, NO.1, rolled hard and 2D surfaces. With the improvement of user requirements for surface quality, the conventional 2D surface state can no longer meet the needs of users. For martensitic stainless steel, the 2D surface production...

Claims

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Application Information

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IPC IPC(8): C21D1/26C21D8/02C21D1/74
CPCC21D1/26C21D1/74C21D8/0226C21D8/0236C21D8/0263C21D8/0273C21D2211/008Y02P10/20
Inventor 纪显彬潘吉祥李聚宝刘天增徐斌
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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