CN105420635A

CN105420635A - High-aluminum stainless steel pump valve casting resistant to oxidization corrosion and preparation method thereof

Info

Publication number: CN105420635A
Application number: CN201510833828.XA
Authority: CN
Inventors: 吴寿涛
Original assignee: Tongling Jingwei Fluid Technology Co Ltd
Current assignee: Tongling Jingwei Fluid Technology Co Ltd
Priority date: 2015-11-25
Filing date: 2015-11-25
Publication date: 2016-03-23

Abstract

The invention discloses a high-aluminum stainless steel pump valve casting resistant to oxidization corrosion. According to the high-aluminum stainless steel pump valve casting, on the basis that low-carbon steel is good in toughness and plasticity, the use amount of elements such as Al, Mo and La is increased properly, and thus both strength and toughness of the material are achieved, the heat stability is achieved, alloy structures are refined uniformly, and good oxidization resistance and creep resistance are achieved; due to the fact that nano Ca-RE intermediate phase alloy powder carried by honeycomb ceramic powder and composite graphene refining agents are added in molten liquid, the heat stability is good, the impurity removal efficiency and the slag melting efficiency are high, and the purity degree of the molten steel can be effectively improved, so that the alloy structures are refined, and surface defects are reduced; the stainless steel casting subjected to heat treatment for multiple times is stable, and the energy-saving and efficient production effect is achieved.

Description

High aluminium stainless steel pump valve foundry goods of a kind of resistance to oxidation corrosion and preparation method thereof

Technical field

The present invention relates to stainless cast steel part technical field, particularly relate to high aluminium stainless steel pump valve foundry goods of a kind of resistance to oxidation corrosion and preparation method thereof.

Background technology

Stainless Steel Pump, valve are widely used in chemical industry, petrochemical industry, oil, papermaking, mining, electric power, liquefied gas, food, pharmacy, plumbing, municipal administration, mechanical equipment coordination, electronic industry, the fields such as urban construction.Pump is the parts carrying various different media, and valve is function unit in pipeline fluid delivery system, it is used to change path section and medium flowing direction, has the functions such as water conservancy diversion, cut-off, adjustment, throttling, non-return, shunting or overflow release, both usually support the use.

Because the medium of Stainless Steel Pump, valve contact is varied, may be water, steam, oil product, gas, mud, various corrosive medium, liquid metal and radioactive fluid etc., therefore higher to the performance requriements of pump valve material, pump valve steel alloy spread in performance is in the market uneven, Production requirement can not be met far away, be badly in need of setting about from technique and formula, obtain the stainless material of more high-quality and high-efficiency.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, high aluminium stainless steel pump valve foundry goods providing a kind of resistance to oxidation to corrode and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of high aluminium stainless steel pump valve foundry goods of resistance to oxidation corrosion, in this stainless cast steel part, the weight percentage of each component is: Cr:18-20%, Ni:5.0-5.5%, N:0.6-1.0%, Mn:1.5-1.8%, Mo:1.5-2.0%, Al:2.0-2.5%, La:0.1-0.2%, Mg:0.1-0.2%, Ti:0.4-0.5%, S < 0.03%, P < 0.03%, C≤0.25%, refining agent 0.3-0.4%, and surplus is Fe and inevitable impurity.

Described refining agent is made up of the raw material of following weight percent: ceramic honey comb powder 5-8, Graphene 0.1-0.2, dehydrated alcohol 10-12, Ca content is the Al-Ca master alloyed powder 5-6 of 75-80wt.%, RE content is 10-15wt.%Al-RE master alloyed powder 3-4, stearic acid 1-2, the preparation method of this refining agent is: first by Al-Ca master alloyed powder, Al-RE master alloyed powder drops in ball grinder together, dehydrated alcohol is added after being uniformly mixed, stearic acid, Graphene, the 2-3h of ball milling mixing in confined conditions, ceramic honey comb powder is added after ball milling terminates, continue grinding 20-30min, after grinding terminates, mixture is taken out, drying at room temperature, remove dehydrated alcohol and stearic acid completely, obtain.

The preparation method of the high aluminium stainless steel pump valve foundry goods of described a kind of resistance to oxidation corrosion is:

(1) each raw material except refining agent is dropped in smelting furnace according to element wt proportioning, be heated to 1450 DEG C of-1560 DEG C of meltings, add refining agent subsequently, after being uniformly mixed, liquation is warming up to 1480-1580 DEG C, refining treatment 30-40min, finally by gained liquation through deslagging, degassed after be poured in mold cavity, naturally cool to the demoulding after room temperature, obtain ingot casting;

(2) 750-800 DEG C is heated to after the ingot casting surface treatment of gained with the temperature rise rate of 100-110 DEG C/h, insulation 4-5h, cold quenching is to 600-650 DEG C subsequently, air cooling is continued to 300-350 DEG C after insulation 2-3h, be warming up to 580-620 DEG C with the speed of 105-115 DEG C/h after insulation 1-2h, after insulation 2-3h, air cooling is to room temperature and get final product.

The present invention suitably improves Al on the basis that soft steel possesses excellent toughness and plasticity, Mo, the consumption of the elements such as La, the strength of materials and toughness are had concurrently, to thermally-stabilised, alloy structure refinement is even, show good oxidation-resistance and creep resistance, add in liquation by the nanometer Ca-RE mesophase alloy powder of ceramic honey comb powder load and the composite refiner of Graphene, Heat stability is good, can reach efficiently except hydridization slag effect, improve the purity of molten steel, refining alloy tissue, reduce surface imperfection, the cast properties obtained after repeatedly thermal treatment is stablized, product reaches the production effect of efficient energy-saving.

Embodiment

In this embodiment stainless cast steel part, the weight percentage of each component is: Cr:18%, Ni:5.0%, N:0.6%, Mn:1.5%, Mo:1.5%, Al:2.0%, La:0.1%, Mg:0.1%, Ti:0.4%, S < 0.03%, P < 0.03%, C:0.25%, refining agent 0.3%, and surplus is Fe and inevitable impurity.

Wherein refining agent is made up of the raw material of following weight percent: ceramic honey comb powder 5, Graphene 0.1, dehydrated alcohol 10, Ca content is the Al-Ca master alloyed powder 5 of 75wt.%, RE content is 10wt.%Al-RE master alloyed powder 3, stearic acid 1, the preparation method of this refining agent is: first by Al-Ca master alloyed powder, Al-RE master alloyed powder drops in ball grinder together, dehydrated alcohol is added after being uniformly mixed, stearic acid, Graphene, the 2h of ball milling mixing in confined conditions, ceramic honey comb powder is added after ball milling terminates, continue grinding 20min, after grinding terminates, mixture is taken out, drying at room temperature, remove dehydrated alcohol and stearic acid completely, obtain.

The preparation method of this embodiment stainless cast steel part is:

(1) each raw material except refining agent is dropped in smelting furnace according to element wt proportioning, be heated to 1500 DEG C of meltings, add refining agent subsequently, after being uniformly mixed, liquation is warming up to 1530 DEG C, refining treatment 30min, finally by gained liquation through deslagging, degassed after be poured in mold cavity, naturally cool to the demoulding after room temperature, obtain ingot casting;

(2) 750 DEG C are heated to after the ingot casting surface treatment of gained with the temperature rise rate of 100 DEG C/h, insulation 4h, subsequently cold quenching to 600 DEG C, continue air cooling to 300 DEG C after insulation 2h, be warming up to 580 DEG C with the speed of 105 DEG C/h after insulation 1h, after insulation 2h, air cooling is to room temperature and get final product.

The cast properties test result prepared is:

Tensile strength: 658.3MPa; Yield strength: 345.5MPa; Breaking tenacity: 387.5MPa; Plastix strain before fracture: 4.4%; Impelling strength: 76.3J/cm ²; Young's modulus: 252.8GPa; Under 200 DEG C of conditions, oxidation weight gain rate is 5.6%, and under 400 DEG C of conditions, oxidation weight gain rate is that under 9.4%, 600 DEG C of conditions, oxidation weight gain rate is 11.4%; Erosion rate≤the 0.005mm/a of its material in acid-base solution.

Claims

1. the high aluminium stainless steel pump valve foundry goods of a resistance to oxidation corrosion, it is characterized in that, in this stainless cast steel part, the weight percentage of each component is: Cr:18-20%, Ni:5.0-5.5%, N:0.6-1.0%, Mn:1.5-1.8%, Mo:1.5-2.0%, Al:2.0-2.5%, La:0.1-0.2%, Mg:0.1-0.2%, Ti:0.4-0.5%, S < 0.03%, P < 0.03%, C≤0.25%, refining agent 0.3-0.4%, and surplus is Fe and inevitable impurity.

2. the high aluminium stainless steel pump valve foundry goods of a kind of resistance to oxidation corrosion as claimed in claim 1, it is characterized in that: described refining agent is made up of the raw material of following weight percent: ceramic honey comb powder 5-8, Graphene 0.1-0.2, dehydrated alcohol 10-12, Ca content is the Al-Ca master alloyed powder 5-6 of 75-80wt.%, RE content is 10-15wt.%Al-RE master alloyed powder 3-4, stearic acid 1-2, the preparation method of this refining agent is: first by Al-Ca master alloyed powder, Al-RE master alloyed powder drops in ball grinder together, dehydrated alcohol is added after being uniformly mixed, stearic acid, Graphene, the 2-3h of ball milling mixing in confined conditions, ceramic honey comb powder is added after ball milling terminates, continue grinding 20-30min, after grinding terminates, mixture is taken out, drying at room temperature, remove dehydrated alcohol and stearic acid completely, obtain.

3. the preparation method of the high aluminium stainless steel pump valve foundry goods of a kind of resistance to oxidation corrosion as claimed in claim 1, it is characterized in that, described preparation method is:

(1) each raw material except refining agent is dropped in smelting furnace according to element wt proportioning, be heated to 1450 DEG C of-1560 DEG C of meltings, add refining agent subsequently, after being uniformly mixed, liquation is warming up to 1480-1550 DEG C, refining treatment 30-40min, finally by gained liquation through deslagging, degassed after be poured in mold cavity, naturally cool to the demoulding after room temperature, obtain ingot casting;