CN102876987A

CN102876987A - High-strength corrosion-resisting stainless steel and manufacturing method thereof

Info

Publication number: CN102876987A
Application number: CN 201210420605
Authority: CN
Inventors: 章磊
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-10-24
Filing date: 2012-10-24
Publication date: 2013-01-16

Abstract

The invention provides high-strength corrosion-resisting stainless steel. By adding elements such as Al and Zr and defining the content and the manufacturing process of each element, the mechanical properties of the stainless steel are improved, the grain size of the stainless steel is more uniform, and the strength, the rigidity, the heat resistance and the corrosion resistance of the stainless steel are improved further. The high-strength corrosion-resisting stainless steel can be widely applied to various mechanical parts and precision industries of ships, aviation and the like.

Description

A kind of high-strength corrosion-resisting stainless steel and preparation method thereof

Technical field

The present invention relates to a kind of high-strength corrosion-resisting stainless steel, especially a kind of high-strength corrosion-resisting stainless steel for various components of machine, grinding tool etc. and preparation method thereof.

Background technology

Existing number of patent application is that 200610046063.6 patent discloses a kind of high-strength corrosion-resistant thermostable nano alloyed steel material and preparation method thereof, main by in the adding Nb in molten steel, add the elements such as W, Mo, V, so that 80% crystallite size is engaged in so that steel alloy has preferably intensity, hardness, the characteristics such as heat-resisting and corrosion-resistant less than 50 nanometers in the steel alloy.

The requirement of each component of machine alloy steel is more and more higher in the prior art, need steel alloy further to improve its intensity, hardness, heat-resisting and corrosion-resistant, and need to have good mechanical property, therefore need to do further improvement to satisfy the demand to present technique.

Summary of the invention

The invention provides a kind of high-strength corrosion-resisting stainless steel, by adding Al element, Zr element etc., and limit content and the manufacture craft of each element, increased its mechanical property, and so that crystallite size is more even, so that its intensity, hardness, heat-resisting and corrosion-resistantly all obtained further raising.

The invention provides a kind of high-strength corrosion-resisting stainless steel, described stainless steel chemistry consists of, below be all weight percent: C:0.2-0.4, W:2.0-3.0, Nb:1.2-1.8, V:3.0-4.0, Cr:4.0-6.0, Al:1.0-1.3, Zr:0.2-0.4, surplus is Fe and impurity, 95% crystallite size is arranged in the stainless steel between the 30-40 nanometer.

Preferred scheme is content of impurities≤0.1, Si≤0.01 wherein, P≤0.01, S≤0.01, Zn≤0.01.

Preferred scheme is for also comprising Y, and Y content is 0.2-0.4.

Preferred scheme is Al: Zr 〉=5: 1, and Al+Zr+Nb+V 〉=6.0.

The present invention also provides a kind of making high-strength corrosion-resisting stainless method, mainly is comprised of following steps:

(1) cast iron and W element are placed the vacuum induction furnace melting, form steel alloy;

(2) steel alloy and other element are placed further melting of vacuum induction furnace, reconcile the ratio of each element, so that C:0.2-0.4, W:2.0-3.0, Nb:1.2-1.8, V:3.0-4.0, Cr:4.0-6.0, Al:1.0-1.3, Zr:0.2-0.4, surplus is Fe and impurity;

(3) molten steel is injected in the grinding tool cast molding.

Preferred scheme is to add Y in the step (2), and Y content is 0.2-0.4.

Preferred scheme is in the step (2), reconciles each element ratio, so that Al: Zr 〉=5: 1, and Al+Zr+Nb+V 〉=6.0.

Sample of the present invention is at ambient temperature through detecting:

Yield strength σ _0.02〉=756N/mm ²

Tensile strength sigma _b〉=868N/mm ²

Elongation δ 〉=24%

Relative reduction in area ψ 〉=60%

Ballistic work AKv 〉=62J

Under the sample room temperature condition of the present invention, stress is 235N/mm ²Process detects under the condition:

Rupture time (Hr) 〉=160 hour.

Process detects under the sample room temperature condition in the background technology:

Yield strength σ _0.02〉=540N/mm ²

Tensile strength sigma _b〉=631N/mm ²

Elongation δ 〉=21%

Relative reduction in area ψ 〉=52%

Ballistic work AKv 〉=53J

Under the sample room temperature condition, stress is 235N/mm in the background technology ²Process detects under the condition:

Rupture time (Hr) 〉=110 hour.

Add the elements such as Al, Zr, can be so that crystallite size be more even;

Foreign matter content should not surpass 0.1, Si≤0.01 especially, and P≤0.01, S≤0.01, Zn≤0.01, otherwise can affect homogeneity and the physical strength of crystallite size;

The adding of Y element can improve physical strength, and increases wear resistance etc.;

In manufacture craft, add first W, W is fully incorporated in the molten steel, increase its hardness.

Sample of the present invention is compared the sample in the background technology, and mechanical property has obtained further raising, and intensity, hardness, heat-resisting and corrosion-resistantly all obtained further raising.Product of the present invention can be widely used in various components of machine, and the accurate industry such as available boats and ships, aviation.

Embodiment

Below the present invention is further detailed explanation.

Embodiment 1

Following table is three samples, and the content of chemical element is as follows in each sample:

Prescription	C	W	Nb	V	Cr	Al	Zr	Si	P	S	Zn
												Sample 1	0.2	2.0	1.4	4.0	6.0	1.1	0.2	0.01	0.01	0.01	0.01
Sample 2	0.3	2.5	1.6	3.5	5.0	1.3	0.25	0.01	0.01	0.01	0.01
												Sample 3	0.4	3.0	1.8	3.0	4.0	1.2	0.2	0.01	0.01	0.01	0.01

To sample 1-3, detect by scanning electron microscope, transmission electron microscope, the crystal size of discovery more than 95% is between the 30-40 nanometer.

This shows, product precipitated phase particle size of the present invention is more even.

Embodiment 2

Sample 1-3 is carried out hardness detect, hardness HRC is respectively 68,70,68, this shows, the hardness of product of the present invention has obtained corresponding raising.

Embodiment 3

Sample 2 basically add respectively 0.2,0.3 and 0.4 Y, be print 21,22,23, test its physical strength:

	σ _0.02	σ _b	δ	ψ	AKv	Hr
							Sample 21	789	892	25	64	66	182
Sample 22	821	932	26	66	67	184
							Sample 23	861	952	26	66	68	183

This shows, add Y element, increased the mechanical property of product of the present invention.

Embodiment 4

In the making method of the present invention, adopted first cast iron and W melting have been made steel alloy, and then added the method for other element melting, find through detecting, its hardness is obviously different, does not adopt method of the present invention, hardness is 58, and adopting method hardness of the present invention is 68, and hardness is significantly improved.

Embodiment 5

Sample 1 is carried out corrosion-resistant experiment, test with the salt mist experiment method: sample is 35 degree in 5%NaCl, temperature, under the pH7.0-7.0 condition, carry out spraying experiment in 72 hours, the product of finding background technology rust spot just occurs 18 hours rear surfaces, the product of patent of the present invention just began to occur after 48 hours, behind the Y of adding 0.2, just began after 63 hours to occur.

Above content be in conjunction with structure of the present invention and working process to its further description of doing, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims

1. high-strength corrosion-resisting stainless steel, described stainless steel chemistry consists of, below be all weight percent: C:0.2-0.4, W:2.0-3.0, Nb:1.2-1.8, V:3.0-4.0, Cr:4.0-6.0, Al:1.0-1.3, Zr:0.2-0.4, surplus is Fe and impurity, 95% crystallite size is arranged in the stainless steel between the 30-40 nanometer.

2. high-strength corrosion-resisting stainless steel according to claim 1 is characterized in that: described content of impurities≤0.1, Si≤0.01 wherein, P≤0.01, S≤0.01, Zn≤0.01.

3. high-strength corrosion-resisting stainless steel according to claim 2, it is characterized in that: also comprise Y, Y content is 0.2-0.4.

4. high-strength corrosion-resisting stainless steel according to claim 3 is characterized in that: described Al: Zr 〉=5: 1, and Al+Zr+Nb+V 〉=6.0.

5. make the stainless method of high-strength corrosion-resisting for one kind, mainly formed by following steps:

(3) molten steel is injected in the grinding tool cast molding.

6. the stainless method of making high-strength corrosion-resisting according to claim 5 is characterized in that: described content of impurities≤0.1, Si≤0.01 wherein, P≤0.01, S≤0.01, Zn≤0.01.

7. the stainless method of making high-strength corrosion-resisting according to claim 6 is characterized in that: add Y in the described step (2), Y content is 0.2-0.4.

8. the stainless method of making high-strength corrosion-resisting according to claim 7 is characterized in that: in the described step (2), reconcile each element ratio, so that Al: Zr 〉=5: 1, and Al+Zr+Nb+V 〉=6.0.