CN1058533C

CN1058533C - Reinforced three-proof material for state treasury door and safe

Info

Publication number: CN1058533C
Application number: CN96111603A
Authority: CN
Inventors: 王文科
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-08-06
Filing date: 1996-08-06
Publication date: 2000-11-15
Anticipated expiration: 2016-08-06
Also published as: CN1172863A

Abstract

The present invention relates to a strengthened dust, water and corrosion resisting material for a treasury door strong box, which comprises the main alloy elements: 0.6 to 1.6 wt% of C, 0.8 to 1.2 wt% of Si, 0.3 to 1.0 wt% of Mn, 2 to 3 wt% of W, 3 to 4 wt% of Wo, 18 to 29 wt% of Cr, 2 to 8 wt% of Ni, 0.1 to 0.5 wt% of Co and balance of Fe. When the smelting, the pouring, the casting, the molding and the alloy discharge are carried out in a medium-frequency induction furnace, 0.5 to 2% of No. 1 element of rare earth is used for modification treatment. The material has favorable anti-drilling performance, anti-cutting performance by acetylene flames and impact resistant performance.

Description

National treasury door, strong box strengthen prevention material

The invention belongs to a kind of steel alloy in engineering materials field, be mainly used in the three anti-national treasury doors that require, strong box.

The national treasury door is the component part of national treasury, is the important safety facility of national treasury, and " National Industrial and Commercial Bank of China's national treasury door standard " stipulated national treasury door security technical capability index, have good anti-drilling, anti-acetylene torch and cut shock proof three anti-requirements.And the national treasury door of domestic production at present mostly adopts general structural carbon steel, this material plasticity, toughness height, and forging property, good weldability, but easily cutting are convenient to the cutting of drilling and acetylene torch, and this prevents that to the national treasury door it is very disadvantageous that violence destroys.Therefore be badly in need of a kind of alloy material that is used for national treasury door strong box of research, to satisfy the special needs of departments such as bank with NBC protective performance.

The objective of the invention is to propose a kind of national treasury door strong box and strengthen prevention material, be used to manufacture national treasury door and strong box, making national treasury door, the existing shortcoming and defect of strong box to solve existing alloy material.Reach three anti-requirements to national treasury door, strong box.

Major technique content of the present invention is, it is to serve as main with the rotten polynary casting alloy of handling of rare earth element with carbon, chromium, nickel that this national treasury door strong box strengthens prevention material, its chemical constitution (weight %) is: carbon C 0.6-1.6%, silicon Si 0.8-1.2%, manganese Mn 0.3-1.0%, tungsten W 2-3%, molybdenum Mo 3-4%, chromium Cr18-29%, nickel 2-8%, cobalt Co 0.1-0.5%, rare earth 0.5-2%, and all the other are iron Fe; Its technology is with alloying element melting in the GW-005 medium-frequency induction furnace, temperature of fusion 1560-1600 ℃, teeming temperature 1460-1500 ℃, casting, add the processing of go bad of 0.5-2% rare earth element when alloy is come out of the stove, reach the further carbide morphology that improves, prevent to gather, refinement product, desulfurization is degassed and the purpose of purify hot metal, then casting.

The design considerations of Chemical Composition is as follows:

Carbon is the element that forms carbide, can facilitate austenite, strengthens matrix, and the increase of carbon content in steel increases the quantity of carbide, improves the intensity and the hardness of steel, and is very favourable to anti-drilling.Carbon can improve molten steel flow, and its content increases, and is convenient to special type and contains golden plate casting.But carbon content is too much, can reduce the plasticity and the toughness of steel, and welding property is descended, and influences welding quality significantly.The content of carbon is controlled at 0.6-1.6% and is advisable.

Element silicon can be strengthened matrix, improves the intensity and the hardness of steel, improves molten steel flow.Alloy is siliceous 1.2% when following, and tree skill shape primary crystal is an austenite; Siliceous when being 1.4-1.6%, matrix produces sorbitizing, can reduce the welding property of national treasury door; Silicone content surpasses at 3% o'clock, will significantly reduce the plasticity and the toughness of steel.The two kinds of situations in back are unfavorable for that three is anti-, so the content of silicon is very important.Its content should be controlled at 0.8-1.2%.

Manganese is to facilitate austenitic element, but the solution strengthening matrix, the intensity and the hardness of raising steel.But manganese can increase hot and cold crackle tendency, and is unfavorable to welding joint mechanical performance and use properties.So manganese content is strict controlled in 0.3-1.0%.

Tungsten can be strengthened matrix, crystal grain thinning, and stable carbide and intermediate compound produce dispersion hardening, improve the heat resistance of steel, the heat effect of opposing acetylene torch.But the molybdenum crystal grain thinning, plasticity, toughness and the protecting against shock ability of raising alloy.Tungsten two elements cooperate with other alloying elements, can obtain property.The content of tungsten is wanted suitably.

Chromium is the element that forms carbide strongly, is the principal element of special alloy.When chromium content during at 12-29%, the intensity of alloy and hardness rise with the increase of chromium content, and is favourable to anti-drilling.Increase because of with chrome content can make carbide by N ₃The C type changes blocky N into ₇C ₃Its microhardness is brought up to 1300-1800 by 800-1200.Isolated N ₇C ₃Alleviated the effect of isolating mutually greatly, can improve the inlay effect of matrix, guaranteed its organic connection, made alloy have shock proof comprehensive mechanical performance carbide to matrix.But surpass at 29% o'clock, alloy becomes fragile, and impelling strength sharply descends.Simultaneously, the increase of chrome content can make the anti-acetylene torch cutting of alloy.So it is favourable that the content of chromium should be controlled at 18-29%.

Nickel is the element that does not form carbide, and the solution strengthening effect is arranged, and can enlarge phasor r district, forms stable austenite under the as cast condition and forms.With the increase of nickel content, and cooperate effectively, can reduce the thermal conductivity of alloy, quicken the blade wearing and tearing with chromium, very favourable to anti-drilling.Poor general in view of the nickel source, its content should be at 2-8% for well.

Technique effect of the present invention is that this national treasury door strong box strengthens prevention material, be to serve as main with the rotten polynary casting alloy of handling of rare earth element with carbon, chromium, nickel, this alloy is through the actual test of simultaneous test, has good " three is anti-" performance, i.e. good resistance drilling, the cutting of anti-acetylene torch, shock proof performance.Also has weldability simultaneously, be convenient to and other surface metal material welding, be the material of ideal national treasury door, strong box comparatively, with this material make national treasury door, strong box effectively prevents criminal offense, provides strong assurance to reliability, the security that improves national treasury.Have socialism and economic benefit widely.

The realization embodiments of the invention are: according to designed Chemical Composition scope, on vacuum induction furnace, smelt stove alloy material of the present invention, the weight proportion of its concrete alloying element is: C 0.75%, Si 0.60%, Mn 0.50%, W 2%, Mo 3%, Cr 29%, Ni 8%, Co 0.4%, and all the other are Fe; By above composition batching, alloy is melting in induction furnace, temperature of fusion 1560-1600 ℃, teeming temperature 1460-1500 ℃, pour into foundry goods, add the processing of going bad of 1% rare earth element when coming out of the stove, reaching the further carbide morphology that improves, crystal grain thinning, desulfurization are degassed and the purpose of purify hot metal.

Claims

1, national treasury door strong box strengthens prevention material, it is characterized in that this material is serves as main with the rotten polynary casting alloy of handling of rare earth element with carbon, chromium, nickel, its chemical constitution (weight %) is carbon C 0.6-1.6%, silicon Si 0.8-1.2%, manganese Mn 0.3-1.0%, tungsten W 2-3%, molybdenum Mo 3-4%, chromium Cr 18-29%, nickel 2-8%, cobalt Co 0.1-0.5%, rare earth 0.5-2%, and all the other are iron Fe.