CN105420626A - Highly anti-corrosion and anti-abrasion stainless steel pump valve casting and preparation method thereof - Google Patents

Abstract

The invention discloses a high anti-corrosion and anti-abrasion stainless steel pump valve casting. On the basis that low-carbon steel has good toughness and plasticity, the dosage of B, Mo,Y and other elements of the stainless steel casting is increased appropriately, the mechanical property of the material is effectively improved, and the excellent strength and toughness are achieved; the impact resistance and the abrasion resistance are good, the corrosion resistance to acid, alkali and various organic matter is high, and the durability is higher; nano-crystallized Ca-RE intermediate alloy powder loaded by honeycomb ceramic powder and a composite refining agent of grapheme are added into molten liquid, the efficient effect of impurity removing and slagging on molten steel is achieved, the purity degree of the molten steel can be effectively improved, and the casting quality is improved; the casting which is obtained through multiple times of heat treatment has a stable property, and the energy-saving and efficient production effect is achieved.

Description

A kind of highly corrosion resistant 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 highly corrosion resistant 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 highly corrosion resistant 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 highly corrosion resistant wear-resistant stainless steel pump valve foundry goods, in this stainless cast steel part, the weight percentage of each component is: Cr:14.0-16.0%, Ni:4.5-5.0%, Mn:0.3-0.5%, B:2.5-3.0%, Mo:1.2-1.5%, Mg:0.01-0.02%, Y:0.8-1.0%, 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 highly corrosion resistant 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 1420 DEG C of-1535 DEG C of meltings, add refining agent subsequently, after being uniformly mixed, liquation is warming up to 1450-1550 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 85-95 DEG C/h, insulation 4-5h, cold quenching is to 450-500 DEG C subsequently, air cooling is continued to 300-350 DEG C after insulation 2-3h, be warming up to 580-650 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 suitably improves B on the basis that soft steel possesses excellent toughness and plasticity, Mo, the consumption of the elements such as Y, effectively improve the mechanical property of material, possesses excellent intensity and toughness, impact wear resistance is good, to acid, alkali and various organic corrosion defensive ability/resistance ability strong, more durable in use, what add in liquation reaches efficiently except hydridization slag effect by the nanometer Ca-RE mesophase alloy powder of ceramic honey comb powder load and the composite refiner of Graphene at molten steel, effectively can improve the purity of molten steel, improve casting quality, the cast properties obtained after repeatedly thermal treatment is stablized, reach the production effect of efficient energy-saving.

Embodiment

In the stainless cast steel part of this embodiment, the weight percentage of each component is: Cr:14.0%, Ni:4.5%, Mn:0.3%, B:2.5%, Mo:1.2%, Mg:0.01%, Y:0.8%, 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 25min, after grinding terminates, mixture is taken out, drying at room temperature, remove dehydrated alcohol and stearic acid completely, obtain.

The stainless preparation method of this embodiment is:

(1) each raw material except refining agent is dropped in smelting furnace according to element wt proportioning, be heated to 1460 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 85 DEG C/h, insulation 4h, subsequently cold quenching to 450 DEG C, continue air cooling to 300 DEG C after insulation 2h, be warming up to 580 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: 725.8MPa; Yield strength: 345.3MPa; Breaking tenacity: 550.8MPa; Plastix strain before fracture: 6.5%; Impelling strength: 65.8J/cm ²; Young's modulus: 206.5.0GPa; Erosion rate≤the 0.003mm/a of material in 10% dilute hydrochloric acid solution, under 500N load, fret wear rate of weight loss is 0.08%.

Claims (3)

1. highly corrosion resistant 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:14.0-16.0%, Ni:4.5-5.0%, Mn:0.3-0.5%, B:2.5-3.0%, Mo:1.2-1.5%, Mg:0.01-0.02%, Y:0.8-1.0%, 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 highly corrosion resistant 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 highly corrosion resistant 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 1420 DEG C of-1535 DEG C of meltings, add refining agent subsequently, after being uniformly mixed, liquation is warming up to 1450-1550 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 85-95 DEG C/h, insulation 4-5h, cold quenching is to 450-500 DEG C subsequently, air cooling is continued to 300-350 DEG C after insulation 2-3h, be warming up to 580-650 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.