CN105420637A - High-elasticity and anti-corrosion stainless steel pump valve casting and preparation method - Google Patents

Abstract

The invention discloses a high-elasticity and anti-corrosion stainless steel pump valve casting. On the basis that low-carbon steel has good toughness and plasticity, the dosage of B, Sn, Be and other elements of the stainless steel casting is increased appropriately, stainless steel materials are endowed with good strength and toughness, and moreover the stainless steel materials has a high elasticity modulus and is resistant to abrasion, impact, corrosion and heat; a composite refining agent of nano-crystallized Ca-RE alloy powder loaded by honeycomb ceramic powder and grapheme are added into molten liquid and can be dispersed in molten steel more uniformly, the efficiency of impurity removing and slagging is higher, the purity degree of the molten steel can be effectively improved, and the casting quality is improved; stainless steel which is obtained through multiple times of heat treatment is stable in property and durable, and the energy-saving and efficient production effect of the product is achieved.

Description

A kind of high-elastic corrosion-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-elastic corrosion-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-elastic corrosion-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-elastic corrosion-resistant stainless steel pump valve foundry goods, in this stainless cast steel part, the weight percentage of each component is: Cr:18-20%, Si:0.4-0.5%, Mn:2.0-3.0%, B:2.0-2.5%, Ni:1.5-2.5%, Cu:0.4-0.5%, N:0.05-0.1%, Sn:0.8-1.0%, Be:0.3-0.4%, S < 0.03%, P < 0.03%, C≤0.25%, refining agent 0.3-0.4%, and all the other are Fe and inevitable impurity.

Described one high-elastic corrosion-resistant stainless steel pump valve foundry goods, described refining agent is made up of the raw material of following weight percent: ceramic honey comb powder 5-6, 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-elastic corrosion-resistant stainless steel pump valve foundry goods, 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-1550 DEG C of meltings, add refining agent subsequently, after being uniformly mixed, liquation is warming up to 1500-1560 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 120-150 DEG C/h, insulation 4-5h, cold quenching is to 600-650 DEG C subsequently, air cooling is continued to 350-400 DEG C after insulation 2-3h, be warming up to 650-680 DEG C with the speed of 120-150 DEG C/h after insulation 1-2h, after insulation 1-2h, 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, Sn, the consumption of the elements such as Be, impart the excellent intensity of stainless material and toughness, possesses high Young's modulus simultaneously, wear resistant and impact resistant, protection against corrosion is heat-resisting, add in liquation disperseed in molten steel by the nanometer Ca-RE alloy powder of ceramic honey comb powder load and the composite refiner of Graphene evenly, except hydridization slag efficiency is higher, effectively can improve the purity of molten steel, improve casting quality, the stainless steel stable performance obtained after repeatedly thermal treatment, durable in use, product reaches 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:18%, Si:0.4%, Mn:2.0%, B:2.0%, Ni:1.5%, Cu:0.4%, N:0.05%, Sn:0.8%, Be:0.3%, S < 0.03%, P < 0.03%, C:0.20%, refining agent 0.3%, and all the other are 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 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 1480 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 120 DEG C/h, insulation 4h, subsequently cold quenching to 600 DEG C, continue air cooling to 350 DEG C after insulation 2h, be warming up to 650 DEG C with the speed of 120 DEG C/h after insulation 1h, after insulation 1h, air cooling is to room temperature and get final product.

The cast properties test result prepared is:

Tensile strength: 750MPa; Yield strength: 315MPa; Breaking tenacity: 543.2MPa; Plastix strain before fracture: 6.5%; Impelling strength: 75.8J/cm ²; Young's modulus: 325.4GPa; Erosion rate≤the 0.005mm/a of material in acid-base solution.

Claims (3)

1. a high-elastic corrosion-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:18-20%, Si:0.4-0.5%, Mn:2.0-3.0%, B:2.0-2.5%, Ni:1.5-2.5%, Cu:0.4-0.5%, N:0.05-0.1%, Sn:0.8-1.0%, Be:0.3-0.4%, S < 0.03%, P < 0.03%, C≤0.25%, refining agent 0.3-0.4%, and all the other are Fe and inevitable impurity.

2. a kind of high-elastic corrosion-resistant stainless steel pump valve foundry goods 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 5-6, 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-elastic corrosion-resistant stainless steel pump valve foundry goods 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-1550 DEG C of meltings, add refining agent subsequently, after being uniformly mixed, liquation is warming up to 1500-1560 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 120-150 DEG C/h, insulation 4-5h, cold quenching is to 600-650 DEG C subsequently, air cooling is continued to 350-400 DEG C after insulation 2-3h, be warming up to 650-680 DEG C with the speed of 120-150 DEG C/h after insulation 1-2h, after insulation 1-2h, air cooling is to room temperature and get final product.