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Fatigue-resistant enamel steel for water heater inner container and preparation process thereof

A water heater liner and preparation technology, which is applied in the steel rolling process and metallurgy fields, can solve the problems of poor processing performance, decreased elongation, and increased production difficulty.

Inactive Publication Date: 2020-10-27
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention uses ultra-low carbon steel to add a variety of alloying elements, which increases the difficulty of production and greatly increases the cost
At the same time, the O content of this invention is higher, the steel inclusions increase, the elongation decreases, and the processing performance deteriorates

Method used

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  • Fatigue-resistant enamel steel for water heater inner container and preparation process thereof
  • Fatigue-resistant enamel steel for water heater inner container and preparation process thereof
  • Fatigue-resistant enamel steel for water heater inner container and preparation process thereof

Examples

Experimental program
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Effect test

Embodiment 1-3

[0032] Embodiment 1-3: The manufacturing method of this low-cost enamelled steel is carried out according to the following steps.

[0033] (1) The chemical composition of the steel coil in each embodiment is shown in Table 1, wherein the balance is Fe and unavoidable impurity elements.

[0034] Table 1: the chemical composition (Wt%) of each embodiment product

[0035]

[0036] (2) According to the composition ratio in Table 1, go through processes such as molten iron desulfurization, converter smelting, and LF refining; The temperature is 570°C, and the thickness of the hot coil is 4.5mm; the hot-rolled steel coil produced is pickled to remove the scale and then cold-rolled, the reduction rate is 60%, and the thickness of the cold-rolled coil is 1.8mm; the cold-rolled steel coil is hooded Annealing, the annealing temperature is 690°C, the annealing time is 8 hours, and the slow cooling time is 2 hours; finally, after the smoothing process, the elongation rate is set to 1....

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Abstract

The invention discloses fatigue-resistant enamel steel for a water heater inner container. The fatigue-resistant enamel steel comprises the following chemical components in percentage by weight: lessthan or equal to 0.08 percent of C, less than or equal to 0.05 percent of Si, less than or equal to 0.40 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent ofS, more than or equal to 0.020 percent of Alt, less than or equal to 0.01 percent of Nb and the balance Fe and inevitable impurity elements. The invention also discloses a preparation process of thefatigue-resistant enamel steel. The fatigue-resistant enamel steel for the water heater inner container is produced by using a CSP (continuous casting and rolling) production line; and the water heater inner container made of the fatigue-resistant enamel steel can bear more than 150,000 fatigue-resistant tests through a bulge test of a water heater manufacturer; and the bulge times of the inner container made of common low-carbon steel is only 60,000-80,000. The enamel steel plate manufactured by using the preparation process has excellent fatigue resistance, fish scaling resistance, enamel performance and formability.

Description

technical field [0001] The invention relates to the technical field of metallurgy and steel rolling technology, in particular to a fatigue-resistant enamel steel for a water heater inner tank and a preparation process thereof. Background technique [0002] With the increase of consumers' demand for extending the service life of electric water heater products, water heater manufacturers update the inner tank, requiring raw material suppliers to improve the strength of raw materials, but at the same time to ensure the enamel performance and processing performance of raw materials. The invention utilizes a CSP continuous casting and rolling production line to produce fatigue-resistant enamel steel products for water heater inner tanks. [0003] The Chinese patent application whose publication number is CN109207850A discloses a steel plate for enamelling with high service strength and a manufacturing method thereof. The steel components involved are: C: 0.1%-0.15%, Si: 0.3%-0.5%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/04C22C38/02C22C38/12C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0236C21D8/0247C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 尚秀廷华国龙陆斌薛越武晓晶张秀青孙长玉兴格乐图郭志
Owner BAOTOU IRON & STEEL GRP
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