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Annealing process of 04Cr13Ni5Mo super martensitic stainless steel medium plate for water and electricity

A technology of martensitic stainless steel and annealing process, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of small number of furnaces, low production efficiency, and unstable performance, so as to improve the surface quality of products and increase production efficiency , the effect of uniform cooling environment

Pending Publication Date: 2021-03-02
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

[0004] At present, the annealing process for this steel type is normalizing + tempering + pickling. The annealing process is carried out in a trolley-type box-type resistance furnace. The disadvantages are low production efficiency and a small number of furnaces; the temperature near the furnace door is not high. Uniformity, resulting in inconsistency between the structure of the board near the furnace door and the middle structure, and unstable pe

Method used

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  • Annealing process of 04Cr13Ni5Mo super martensitic stainless steel medium plate for water and electricity

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020]Example 1

[0021]Step 1. Pickling: 10 pieces of 60mm thick 04Cr13Ni5Mo hot-rolled super martensitic stainless steel medium-thick plates are cut to length without annealing process, pickled directly in the continuous pickling line, and continuously enters the pickling line. Shot blasting current 65-75A, throwing speed 2000-2300r / min, using "mixed acid pickling" process, HF solution: 55-70g / L, HNO3Solution: 120-150g / L, temperature: 60-70℃, pickling speed 5-8m / min. The hot-rolled oxide scale is pickled and cleaned once.

[0022]Step 2. After pickling, 10 pieces of 04Cr13Ni5Mo steel plates are continuously loaded at the entrance of the continuous annealing furnace and normalized. The normalizing temperature is 1050-1100℃, the heating time is 60min, and the holding time: 120min. The steel plate is in the annealing furnace. As the roller table swings in the furnace, the normalized steel plate slowly exits the annealing furnace exit door along with the roller table, enters the quenching m...

Example Embodiment

[0025]Example 2

[0026]Step 1. Pickling: 10 pieces of 04Cr13Ni5Mo hot-rolled super martensitic stainless steel medium-thick plates with a thickness of 20mm are cut to length without annealing process, pickled directly in the continuous pickling line, and continuously enters the pickling line. Shot blasting current 65-75A, throwing speed 2000-2300r / min, using "mixed acid pickling" process, HF solution: 55-70g / L, HNO3Solution: 120-150g / L, temperature: 60-70℃, pickling speed 5-8m / min; pickling clean the hot-rolled oxide scale at one time.

[0027]Step 2. After pickling, 10 pieces of 04Cr13Ni5Mo steel plates are continuously loaded at the entrance of the continuous annealing furnace and normalized. The normalizing temperature is 1050-1100℃, the heating time is 20min, and the holding time: 40min. The steel plate is in the annealing furnace. As the roller table swings in the furnace, the normalized steel plate slowly exits the annealing furnace exit door along with the roller table, enters the...

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Abstract

The invention discloses a continuous annealing acid pickling process of a 04Cr13Ni5Mo super martensitic stainless steel medium plate for water and electricity, and belongs to the technical field of stainless steel heat treatment processes. The process adopts the following sequential treatment processes of direct acid pickling, normalizing treatment, tempering treatment and post-annealing plate acid pickling. By adjusting process routes and optimizing parameters, the pickling frequency of the steel plate is reduced, and the surface quality, the percent of pass and the production efficiency of aproduct are greatly improved. The process is to eliminate earlier-stage outdated processes, a roller hearth type continuous annealing furnace is adopted for continuous annealing, and the production continuity and the stability of the product quality are effectively ensured.

Description

technical field [0001] The invention belongs to the technical field of stainless steel heat treatment technology, and in particular relates to a continuous annealing and pickling process for 04Cr13Ni5Mo hydropower martensitic stainless steel plate. Background technique [0002] 04Cr13Ni5Mo super martensitic stainless steel is the most commonly used hydropower stainless steel, which reduces carbon (ωc<0.03% or <0.025%) and sulfur (ωc<0.01% or <0.005%) on the basis of Cr13 martensitic stainless steel, and increases nickel (ωc=4%~6.5%) and molybdenum (maximum ωc=2.5%) have high strength, good ductility and welding performance, and make it contain CO 2 and H 2 The corrosion resistance in the medium of S is greatly improved. It is mainly used in the flow-passing parts such as blades of water turbines, wear-resistant plates, liners, anti-leakage ring materials, and embedded parts of hydraulic projects. It has high strength, high toughness and good welding performanc...

Claims

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Application Information

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IPC IPC(8): C21D1/28C21D1/18C21D9/00C21D6/00C23G1/08B24C1/08
CPCC21D1/28C21D1/18C21D9/0081C21D6/004C23G1/086B24C1/08C21D2211/008
Inventor 李照国潘吉祥纪显彬徐斌王珂武小强
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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