CN103060666A - Casting method of alloy body of spherical check valve - Google Patents

Abstract

The invention discloses a casting method of the alloy body of a spherical check valve, comprising the following steps of: a, preparing the following ingredients by weight percent (100% in total): 30-50% of pig iron, 30-40% of scrap steel, 15-20% of scrap parts and 10-20% of iron scraps; and controlling the chemical components: 2.85-3.0% of C, 1.2-1.5% of Si, 0.8-1.2% of Mn, 0.06-0.08% of P, 0.05-0.07% of S, 0.25-0.35% of Cr, and 0.7-0.9% of Cu; b, heating the ingredients to 1400-1500 DEG C, melting to obtain molten metal, testing the content of the chemical component, adding corresponding lacking element metal to the molten metal, and uniformly mixing to obtain a pouring liquid. The powder metallic material and a preparation technology disclosed by the invention have high production continuity and high material utilization rate, thus being suitable for mass production, and reducing the cost.

Description

A kind of castmethod of ball non-return valve alloy valve body

Technical field

The present invention relates to a kind of preparation method of ball non-return valve, specifically belong to a kind of castmethod of ball non-return valve alloy valve body.

Background technology

Vacuum breaker is useful in chloroazotic acid, sulfuric acid, hydrochloric acid, hydrofluoric acid and various organic acid, strong acid, the strong oxidizer of-50～150 ℃ various concentration, also is applicable to highly basic organic solvent and other corrosive gases of various concentration, uses on the pipeline of liquid medium.

At present, preparation vacuum breaker industry, domestic ball non-return valve valve body all adopts common rapid steel material, or the stainless steel material is by machining ball non-return valve valve body.Compare with powder metallurgy vacuum breaker processed, the ball non-return valve valve body process velocity that common rapid steel material or the machining of stainless steel material are made is slower, material use efficiency is not high, and powder metallurgical technique is made stopping valve, not only material use efficiency is high, and be suitable for producing in enormous quantities, before assembling is used, need the powder metallurgy valve body is carried out a small amount of ground finish.

Summary of the invention

Technical problem to be solved by this invention is for vacuum breaker Technology present situation, and the castmethod of a kind of ball non-return valve alloy valve body that a kind of production efficiency that provides is high, manufacturing cost is lower.

The technical solution used in the present invention is as follows:

A kind of castmethod of ball non-return valve alloy valve body includes following steps:

A, take by weighing raw material by constitutive material weight proportion pig iron 30-50%, steel scrap 30-40%, useless parts 15-20%, waste iron filing 10-20, add up to 100%, control its chemical composition C:2.85-3.0%, Si:1.2-1.5%, Mn:0.8-1.2%, P:0.06-0.08%, S:0.05-0.07%, Cr 0.25-0.35%, Cu 0.7-0.9%;

B, above-mentioned starting material are heated to 1400-1500 ℃, are fused into molten metal, detect the content of chemical composition, then in above-mentioned molten metal, add the metal element of corresponding shortage, mix, form potting syrup;

C, in sand mold, pour into a mould potting syrup by cast gate, cooled and solidified, steam treatment namely gets check valve body after taking out, and described steam treatment is the water atomization steam treatment, and the treatment time is 4-5 hour, and temperature is 550-650 ℃;

D, quench treatment: check valve body sent into be heated to 850-890 ℃ in the heat treatment furnace, and insulation 2-3 hour; Then, cool off with quenching oil;

E, temper: the check valve body after will quenching is sent into and is heated to 300-400 ℃ in the tempering stove, insulation 50-70min;

F, bonderizing, be 180-200 ℃ with workpiece at showing tremendous enthusiasm closure temperature at normal temperatures, the employing pH value is 8 surface conditioner processing 1min, after dripping most 1-2min, adopt phosphorization agent to process 15-20min, after dripping most 1-2min, adopt clear water to clean 1-2min again, after dripping again most 1-2min, process 0.5-1min workpiece is placed 78-100 ℃ hot water.

Bonderizing, be 190 ℃ with workpiece at showing tremendous enthusiasm closure temperature at normal temperatures, the employing pH value is 8 surface conditioner processing 1min, after dripping most 1.5min, adopt phosphorization agent to process 17min, after dripping most 1.5min, adopt clear water to clean 1.5min again, after dripping again most 1.5min, process 0.7min workpiece is placed 90 ℃ hot water.

Compared with prior art, the invention has the advantages that:

The present invention passes through technique scheme, one-piece construction is scientific and reasonable, the corresponding energy consumption that reduced has reduced materials consumption and cost and has dropped into, and working accuracy improves greatly, compared with prior art material use efficiency is brought up to more than 90% by present 65%, power consumption reduces about 70%, and recruitment reduces 3/4ths, and a machine tool two people operate the malleable workpiece of split run more than 550, improve about 4 times of work efficiency, the positively effect highly significant of generation.

It is as follows that mechanical property of the present invention detects data:

Tensile strength sigma b (MPa): 〉=1180

Yield strength σ s (MPa): 〉=930

Elongation δ 5 (%): 〉=12

Relative reduction in area ψ (%): 〉=55

Impact energy Ak v (J): 〉=65

Notched bar impact strength α kv (J/cm2): 〉=78

Hardness :≤223HB.

Embodiment

The method of a kind of powder metallurgy ball non-return valve valve body processed includes following steps:

A, take by weighing raw material by constitutive material weight proportion pig iron 30-50%, steel scrap 30-40%, useless parts 15-20%, waste iron filing 10-20, add up to 100%, control its chemical composition C:2.85-3.0%, Si:1.2-1.5%, Mn:0.8-1.2%, P:0.06-0.08%, S:0.05-0.07%, Cr 0.25-0.35%, Cu 0.7-0.9%;

B, above-mentioned starting material are heated to 1400-1500 ℃, are fused into molten metal, detect the content of chemical composition, then in above-mentioned molten metal, add the metal element of corresponding shortage, mix, form potting syrup;

C, in sand mold, pour into a mould potting syrup by cast gate, cooled and solidified, steam treatment namely gets check valve body after taking out, and described steam treatment is the water atomization steam treatment, and the treatment time is 4-5 hour, and temperature is 550-650 ℃;

D, quench treatment: check valve body sent into be heated to 850-890 ℃ in the heat treatment furnace, and insulation 2-3 hour; Then, cool off with quenching oil;

E, temper: the check valve body after will quenching is sent into and is heated to 300-400 ℃ in the tempering stove, insulation 50-70min;

F, bonderizing, be 190 ℃ with workpiece at showing tremendous enthusiasm closure temperature at normal temperatures, the employing pH value is 8 surface conditioner processing 1min, after dripping most 1.5min, adopt phosphorization agent to process 17min, after dripping most 1.5min, adopt clear water to clean 1.5min again, after dripping again most 1.5min, process 0.7min workpiece is placed 90 ℃ hot water.

It is as follows that mechanical property of the present invention detects data:

Tensile strength sigma b (MPa): 〉=1180

Yield strength σ s (MPa): 〉=930

Elongation δ 5 (%): 〉=12

Relative reduction in area ψ (%): 〉=55

Impact energy Ak v (J): 〉=65

Notched bar impact strength α kv (J/cm2): 〉=78

Hardness :≤223HB.

Claims (2)

1. the castmethod of a ball non-return valve alloy valve body is characterized in that including following steps:

A, each alloying constituent of configuration liquation: C:2.85-3.0%, Si:1.2-1.5%, Ti:8.8-9.2%, P:0.06-0.08%, S:0.05-0.07%, Cr 0.25-0.35%, Mo 3.7-4.9%, surplus is Fe; The valve rod blank is arrived in the molten alloy precision casting, carry out hot isostatic pressing at the most high β-transition temperature in titanium maxter alloy and minimum temperature than low 100 ℃ of β-transition temperature, carry out solution annealing 700-900 ℃ temperature, reheat to 650-760 ℃, be incubated 3-5 hour, stove is chilled to 300 ℃, is incubated 4 hours, reheats to 650-760 ℃, be incubated 17 hours, be cooled to 450 ℃ with 50 ℃/hour, again with 20 ℃/hour, be cooled to 140 ℃;

B, the valve body that above-mentioned steps is obtained carry out ground, deburring;

D, quench treatment: check valve body is sent into be heated to 850-890 ℃ in the heat treatment furnace again, and be incubated 2-3 hour; Then, cool off with quenching oil;

E, temper: the check valve body after will quenching is sent into and is heated to 300-400 ℃ in the tempering stove, insulation 50-70min;

F, bonderizing, be 180-200 ℃ with workpiece at showing tremendous enthusiasm closure temperature at normal temperatures, the employing pH value is 8 surface conditioner processing 1min, after dripping most 1-2min, adopt phosphorization agent to process 15-20min, after dripping most 1-2min, adopt clear water to clean 1-2min again, after dripping again most 1-2min, process 0.5-1min workpiece is placed 78-100 ℃ hot water.

2. the castmethod of a kind of ball non-return valve alloy valve body according to claim 1 is characterized in that:

Bonderizing, be 190 ℃ with workpiece at showing tremendous enthusiasm closure temperature at normal temperatures, the employing pH value is 8 surface conditioner processing 1min, after dripping most 1.5min, adopt phosphorization agent to process 17min, after dripping most 1.5min, adopt clear water to clean 1.5min again, after dripping again most 1.5min, process 0.7min workpiece is placed 90 ℃ hot water.