CN105420636A - High-plasticity anti-abrasion stainless steel pump valve casting and preparation method thereof - Google Patents

Abstract

The invention discloses a high-plasticity anti-abrasion stainless steel pump valve casting. On the basis that low-carbon steel has the characteristics of good toughness and plasticity, the dosage of Mn, Ti, Sn, Bi and other elements of the stainless steel casting is increased appropriately, and stainless steel casting materials are endowed with more excellent strength and toughness; molding machining is easy, and the material surface is good in lubricity and abrasion resistance and has excellent anti-corrosion capacity to acidic fluid; a refining agent containing nano-crystallized Ca-RE intermediate alloy powder is added into molten liquid and adsorbed on honeycomb ceramic powder, under the high-temperature condition, the performance is more stable, and the efficiency of impurity removing and slagging is higher; the purity degree of molten steel can be effectively improved, and the casting quality is improved; stainless steel which is obtained through multiple times of heat treatment has mature and stable properties, the requirements for the complex structural characteristics and variable application environments of a pump valve can be met, and the energy-saving and efficient production effect can be achieved.

Description

A kind of high-ductility wear-resistant stainless steel pump valve foundry goods and preparation method thereof

Technical field

The present invention relates to stainless cast steel part technical field, particularly relate to a kind of high-ductility wear-resistant stainless steel pump valve foundry goods 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, provides a kind of high-ductility wear-resistant stainless steel pump valve foundry goods and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of high-ductility wear-resistant stainless steel pump valve foundry goods, in this stainless cast steel part, the weight percentage of each component is: Cr:12-18%, Ni:3.0-5.0%, Bi:0.3-0.5%, Ti:1.5-2.0%, Mn:2.5-3.0%, Sn:0.5-0.8%, Cu:0.8-1.2%, N:0.10-0.20%, Si:0.3-0.4%, 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 described a kind of high-ductility wear-resistant stainless steel pump valve foundry goods is:

(1) each raw material except refining agent is dropped in smelting furnace according to element wt proportioning, be heated to 1400 DEG C of-1520 DEG C of meltings, add refining agent subsequently, after being uniformly mixed, liquation is warming up to 1500-1550 DEG C, refining treatment 40-50min, 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) 700-750 DEG C is heated to after the ingot casting surface treatment of gained with the temperature rise rate of 80-100 DEG C/h, insulation 4-5h, cold quenching is to 550-600 DEG C subsequently, air cooling is continued to 350-400 DEG C after insulation 2-3h, be warming up to 550-600 DEG C with the speed of 120-150 DEG C/h after insulation 1-2h, after insulation 2-3h, air cooling is to room temperature and get final product.

The present invention possesses on the basis of excellent toughness and plasticity feature at soft steel and suitably improves Mn, Ti, Sn, the consumption of the elements such as Bi, impart the more excellent intensity of stainless cast steel part material and plasticity, be easy to forming process, material surface oilness is good, wear-resistant, and have good antiseptic power to acidic fluid, the refining agent added in liquation contains the Ca-RE master alloyed powder of nanometer, it is adsorbed on ceramic honey comb powder, performance is more stable under the high temperature conditions, except hydridization slag efficiency is higher, effectively can improve the purity of molten steel, improve casting quality, the stainless steel performance obtained after repeatedly thermal treatment is mature and stable, the constructional feature of pump valve complexity and changeable environment for use can be met, reach the production effect of efficient energy-saving.

Embodiment

In this embodiment stainless cast steel part, the weight percentage of each component is: Cr:12%, Ni:3.0%, Bi:0.3%, Ti:1.5%, Mn:2.5%, Sn:0.5%, Cu:0.8%, N:0.10%, Si:0.3%, 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 1450 DEG C of meltings, add refining agent subsequently, after being uniformly mixed, liquation is warming up to 1500 DEG C, refining treatment 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) 700 DEG C are heated to after the ingot casting surface treatment of gained with the temperature rise rate of 80 DEG C/h, insulation 4h, subsequently cold quenching to 550 DEG C, continue air cooling to 350 DEG C after insulation 2h, be warming up to 550 DEG C with the speed of 120 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: 718.6MPa; Yield strength: 543.4MPa; Breaking tenacity: 510.5MPa; Plastix strain before fracture: 10.2%; Impelling strength: 70.2/cm ²; Young's modulus: 205.2GPa; Under 500N load, the wear weight loss rate of material is 0.06%.

Claims (3)

1. a high-ductility wear-resistant stainless steel pump valve foundry goods, it is characterized in that, in this stainless cast steel part, the weight percentage of each component is: Cr:12-18%, Ni:3.0-5.0%, Bi:0.3-0.5%, Ti:1.5-2.0%, Mn:2.5-3.0%, Sn:0.5-0.8%, Cu:0.8-1.2%, N:0.10-0.20%, Si:0.3-0.4%, S < 0.03%, P < 0.03%, C≤0.25%, refining agent 0.3-0.4%, and surplus is Fe and inevitable impurity.

2. a kind of high-ductility as claimed in claim 1 wear-resistant stainless steel pump valve foundry goods, 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 a kind of high-ductility as claimed in claim 1 wear-resistant stainless steel pump valve foundry goods, 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 1400 DEG C of-1520 DEG C of meltings, add refining agent subsequently, after being uniformly mixed, liquation is warming up to 1500-1550 DEG C, refining treatment 40-50min, 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) 700-750 DEG C is heated to after the ingot casting surface treatment of gained with the temperature rise rate of 80-100 DEG C/h, insulation 4-5h, cold quenching is to 550-600 DEG C subsequently, air cooling is continued to 350-400 DEG C after insulation 2-3h, be warming up to 550-600 DEG C with the speed of 120-150 DEG C/h after insulation 1-2h, after insulation 2-3h, air cooling is to room temperature and get final product.