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Preparation method of nickel-chrome alloy steel

An alloy steel and nickel-chromium technology, which is applied to low-alloy steel and its preparation, and the medium field containing nickel-chromium, can solve the problems of not being comprehensively utilized, and achieve the effects of good economic benefits, improved strength, and improved performance.

Active Publication Date: 2012-01-18
GUANGXI SHENGLONG METALLURGICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are a large number of low-grade and ultra-low-grade nickel ores in laterite nickel ore, such as nickel ore containing less than 1.5% and iron content of 30%-50%, especially low-grade laterite with nickel content of ≤1% and iron content of 45%-50% Nickel ore, the various elements contained in it have not yet been comprehensively utilized

Method used

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  • Preparation method of nickel-chrome alloy steel
  • Preparation method of nickel-chrome alloy steel
  • Preparation method of nickel-chrome alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 HRB400 hot-rolled ribbed steel bar

[0033] The production process is as follows:

[0034] (1) select the laterite nickel ore containing nickel 1.0%, chromium 1.2%, iron 50% for use, first through drying equipment drying for subsequent use;

[0035] (2) The dried laterite nickel ore and the iron ore containing 61% iron are mixed according to the weight ratio of 1.5:8.5, and 90% iron-containing ore, 5% quicklime and 5% coal powder are added according to the weight for batching , control the water content to 9.5-10wt%, mix and pelletize, and then carry out cloth and sintering. The temperature of the ignition furnace of the sintering machine is controlled at 1050-1100°C, the temperature of the exhaust gas is controlled at 130-150°C, and the negative pressure of the bellows is controlled at -12kpa~ -13kpa, get sintered ore;

[0036] (3) The sintered ore is smelted in a blast furnace, and the obtained molten iron contains 0.12% of nickel and 0.3% of chromium; ...

Embodiment 2

[0044] Embodiment 2HRB400 hot-rolled ribbed steel bar

[0045] The production process is as follows:

[0046] (1) select the laterite nickel ore containing nickel 1.0%, chromium 1.5%, iron 50% for use, first through drying equipment drying for subsequent use;

[0047] (2) sintering the dried laterite nickel ore and iron ore containing 61% iron according to the weight ratio of 1.5:8.5;

[0048] (3) Smelting the sintered ore in a blast furnace, and the obtained molten iron contains 0.15% nickel and 0.45% chromium;

[0049] All the other steps and technology are with embodiment 1.

[0050] The specific ingredients are shown in Table 2

[0051] Table 2

[0052] the element

[0053] The carbon equivalent calculated according to the carbon equivalent calculation formula Ceq=C+Mn / 6+(Cr+V+Mo) / 5+(Cu+Ni) / 15 complies with the provisions of GB1499.1.

Embodiment 3

[0059] Embodiment 3HRB500 high-strength 500MPa earthquake-resistant and weather-resistant steel bar

[0060] The production process is as follows:

[0061] (1) select the laterite nickel ore containing nickel 0.8%, chromium 1.1%, iron 50% for use, first through drying equipment drying for subsequent use;

[0062] (2) The dried laterite nickel ore and iron ore containing 61% iron are mixed according to the weight ratio of 7:3, and 90% iron-containing ore, 5% quicklime, and 5% coal powder are added according to the weight for batching , control the water content to 9.5-10wt%, mix and pelletize, and then carry out cloth and sintering. The temperature of the ignition furnace of the sintering machine is controlled at 1050-1100°C, the temperature of the exhaust gas is controlled at 130-150°C, and the negative pressure of the bellows is controlled at -12kpa~ -13kpa, get sintered ore;

[0063] (3) Smelting the sintered ore in a blast furnace, and the obtained molten iron contains 0....

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Abstract

The invention relates to a preparation method of nickel-chrome alloy steel, which comprises the following steps of ore sintering, sinter smelting, refining and casting; the iron-containing ore material comprises, on a weight basis, 10-100% of laterite-nickel ore and 0-90% of iron ore. The invention also relates to the alloy steel obtained by the preparation method, and alloy steel bars obtained by the alloy steel through further rolling. The invention adopts cheap laterite-nickel ore resources instead of the whole or part of the iron ore resources for the preparation of the alloy steel and steel bars; not only a lot of iron in the laterite-nickel ore is effectively used, but also the nickel, chromium elements in the laterite-nickel ore are made full use of; the production process is simplified; the cost is reduced; and the performance of the steel is significantly improved.

Description

technical field [0001] The invention relates to the field of alloy steel smelting, in particular to medium and low alloy steel containing nickel and chromium and a preparation method thereof. Background technique [0002] At present, my country's iron ore resources are gradually decreasing, and steel production capacity has been greatly expanded. Most of the iron ore resources for steel production are imported, and the cost is high. With the acceleration of the urbanization process, the safety of buildings has been paid more and more attention. The existing domestic construction industry mostly uses HRB335 and HRB400 hot-rolled ribbed steel bars, but the strength and seismic standards of these types of steel bars are far lower than the HRB500 or even higher steel bars commonly used abroad. Domestic research on high-strength steel bars mainly focuses on the addition of trace elements. For example, Chinese patent CN101717898A discloses a HRB500E high-strength seismic steel ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C38/46C22B1/00
Inventor 柯雪利王长城
Owner GUANGXI SHENGLONG METALLURGICAL CO LTD
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