Steel sheet for cans, hot-rolled steel sheet to be used as the base metal and processes for production of both

A manufacturing method and steel sheet technology, which are applied in the field of manufacturing steel sheets for cans and hot-rolled steel sheets for their base materials, can solve the problems of increased manufacturing processes, poor workability of DR materials, and high production costs

Active Publication Date: 2012-10-03
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, DR materials that lack ductility are difficult to apply to special-shaped cans and the like due to poor processability
In addition, DR material has higher production cost due to the increase of manufacturing process compared with the steel plate subjected to temper rolling (pressure adjustment) after normal annealing

Method used

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  • Steel sheet for cans, hot-rolled steel sheet to be used as the base metal and processes for production of both
  • Steel sheet for cans, hot-rolled steel sheet to be used as the base metal and processes for production of both
  • Steel sheet for cans, hot-rolled steel sheet to be used as the base metal and processes for production of both

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] A steel containing the composition shown in Table 1 with the balance consisting of Fe and unavoidable impurities was smelted in a converter to obtain a billet. After reheating the obtained steel slab at 1250 degreeC, hot rolling was started. Hot rolling is carried out at a finishing temperature of 880°C to 900°C, cooled at an average cooling rate of 20°C to 40°C / s before coiling, and coiled at a coiling temperature of 620°C to 700°C. Next, after pickling, cold rolling is performed at a rolling reduction of about 90 to 94%, to manufacture a thin steel sheet of 0.17 to 0.2 mm. The obtained thin steel sheet was heated to 690 to 750° C. at a heating rate of 15° C. / second, and continuous annealing was performed at 690 to 750° C. for 20 seconds. Next, after cooling, temper rolling is performed so that the rolling ratio (measured by elongation) becomes 1.5% or less, and normal chrome plating (electroplating) is continuously performed to obtain a non-tin-plated steel sheet. I...

Embodiment 2

[0132] A steel containing the composition shown in Table 3 (same as No. 1 of Example 1) and the balance consisting of Fe and unavoidable impurities was melted in a real machine converter to obtain a billet. After reheating the obtained steel slab at 1250 degreeC, hot rolling was started. Hot rolling is carried out at a finishing temperature of 830°C to 900°C, cooled at an average cooling rate of 16°C to 45°C / s before coiling, and coiled at a coiling temperature of 580°C to 720°C. Next, cold rolling is performed at a rolling reduction of 75 to 94%, to produce a thin steel plate of 0.15 to 0.18 mm. The obtained thin steel sheet was heated to 630-740° C. at a heating rate of 20° C. / second, and continuous annealing was performed at 630-740° C. for 20-30 seconds. Next, after cooling, temper rolling was performed so that the rolling ratio was 1.5% or less, and normal chrome plating was continuously performed to obtain a non-tin-plated steel sheet. The detailed manufacturing condit...

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Abstract

In producing a steel sheet for cans, a steel sheet which consists substantially of ferrite single-phase structure and has a mean grain diameter of 7[mu]m or below and which exhibits a yield strength of 500MPa or above, a yield ratio of 0.9 or above, a total elongation of 10% or above, and deltar of -0.50 to 0 after coating and baking is produced by incorporating C: 0.01 to 0.12%, Si: 0.005 to 0.5%, Mn: 0.3 to 1.5%, P: 0.005 to 0.2%, Al: 0.10% or below, N: 0.012% or below, and Nb: 0.005 to 0.10% and combining solid solution hardening, precipitation hardening, and grain refinement hardening. The hot rolling is conducted principally under the conditions of FT of 870 DEG C or above, cooling rate after hot rolling of 40 DEG C / s or below, and CT of 620 DEG C or above to adjust the mean grain size of a hot-rolled sheet serving as material for the steel sheet for cans to 6[mu]m or above.

Description

technical field [0001] The present invention relates to a can steel sheet (tin mill black plate) and a hot-rolled steel sheet used as a base material thereof. The present invention also relates to a method for producing a steel sheet for a can and a hot-rolled steel sheet for its base material. Specifically, it relates to a hot-rolled steel sheet used for a steel sheet for cans and a base material thereof with high ductility, high strength, and small anisotropy (Δr) (in-plate plastic anisotropy), and a method for producing the same. Background technique [0002] In recent years, in order to expand the demand for steel cans, strategies such as reducing can manufacturing costs and introducing new types of cans such as bottle shaped cans and shaped cans into the market have been adopted. [0003] As a strategy for reducing the cost of can manufacturing, cost reduction of raw materials can be mentioned. That is, in both the two-piece can that is drawn and the three-piece can i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/12
CPCC21D9/46C21D8/04C22C38/02C21D9/48C22C38/12C22C38/04
Inventor 西原友佳小岛克己岩佐浩树山下阳俊饭住健尔荻本省三
Owner JFE STEEL CORP
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