CN1295369C - D-type graphite cast iron containing lead, arsenic and tin - Google Patents

Abstract

The present invention relates to D-type graphite cast iron containing lead, arsenium and tin, the performance of which is enhanced. The present invention overcomes the defect that plumbum, arsenium and tin have adverse effect on the performance of cast iron in the prior art. The D-type graphite cast iron containing lead, arsenium and tin contains 3.9 to 4.5 portions of C, 1.2 to 1.6 portions of Si, 0.6 to 0.95 portion of Mn, at most 0.07 portion of P, at most 0.04 portion of S, 0.005 to 0.009 portion of Pb, 0.03 to 0.08 portion of As, 0.1 to 0.4 portion of Sn, 0.01 to 0.02 portion of Al, 0.04 to 0.09 portion of Ti and Fe for the rest. The present invention has the advantages of high strength property and favorable antioxygenic property. The present invention can be used for high-strength members such as refrigerators, compressor crankshafts and cam shafts, can be used for heat-resistance members such as glass moulds and can also be used for heat-resistance wear-resistance castings such as mill rollers, etc. The present invention is a novel engineering material having the advantages of low cost and simple preparation technique.

Description

Leaded, arsenic, tin D type Graphite Iron Cast

Technical field:

The present invention relates to the D type Graphite Iron Cast of a kind of leaded, arsenic, tin.

Background technology:

Lead, arsenic, tin are the main local cast irons in Fujian Province---the major impurity element in the pig iron of Longyan, the past thinks that always these impurity elements are very deleterious.But discover that a common influence of these elements is super cooling tendencies that graphite is separated out in increasing cast iron, forms cold D type graphite in cast iron.The microcell Spectrum Analysis shows that in the A type graphite district, lead, arsenic, tin are mainly concentrated and is distributed on the matrix; And in D type graphite district, lead, arsenic, tin are mainly concentrated and are distributed on the graphite.Like this, utilize Longyan pig iron to produce the D type Graphite Iron Cast, just can utilize this alienation behavior in cast iron of lead, arsenic, tin, reduce of the harm of these impurity elements matrix.Find also that under study for action there is (Pb≤0.005% in the trace of lead, arsenic, tin; As≤0.013%; Sn≤0.1%) be favourable to the performance that improves cast iron.Therefore, utilization contains Pb, As, Sn Longyan pig iron is produced the D type Graphite Iron Cast, most of lead, arsenic, tin are collected on the D type graphite, lead, arsenic, the tin of trace remain on the matrix, matrix is strengthened, avoid reaching and turning bane into boon, become the purpose that impurity element is an alloying element because the ferrite of D type Graphite Iron Cast association causes the reduction of D type Graphite Iron Cast performance.

Tradition thinks that the D type Graphite Iron Cast is the unfavorable special-shaped graphite form of separating out (tissue signature of D type Graphite Iron Cast is: tiny dendrite point graphite is distributed on the matrix) under supercooled state.But studies show that in recent years, the D type Graphite Iron Cast not only has peculiar damping property of graphitic cast iron and wear resistance, and because its specific molding condition and chemical ingredients, make its macrostructure's densification, finally aspect mechanical property, resistance toheat, machinability, all be better than A type graphite cast iron (tissue signature of A type graphite cast iron is: flake graphite is uniformly distributed in the matrix, and the cutting action of graphite end is big).Just, cause domestic and international founder author's extensive concern because the D type Graphite Iron Cast has so many advantages.

Summary of the invention:

The invention solves lead in the prior art, arsenic, tin element cast iron is played the defective of deleterious effect, a kind of leaded, arsenic, tin D type Graphite Iron Cast that can improve D type Graphite Iron Cast performance is provided.

Technical scheme of the present invention is as follows: it comprises following chemical components and weight percent:

Carbon C 2.9～3.5%; Silicon Si 2.4～3.6%;

Manganese Mn 0.7～0.9%; Phosphorus P≤0.095%;

Sulphur S≤0.04%; Plumbous Pb 0.003～0.008%;

Arsenic As 0.02～0.07%; Tin Sn 0.08～0.4%;

Aluminium Al 0.1～0.3%; Titanium Ti 0.07～0.10%;

All the other are Fe.

The D type Graphite Iron Cast that the present invention produces not only has very high strength property, and has a good antioxidant property, refrigerator, compressor crank shaft had both been can be applicable to, the strength member that camshaft is such, can be applicable to the such heat-resistant piece of glass mold again, and the not only heat-resisting but also attrition resistant like this foundry goods of roll, be that a kind of cost is low, the simple new engineering material of reparation technology.This has fully shown and utilizes the Fujian Province iron ore to smelt the wide research prospect that the pig iron is produced leaded, arsenic, tin D type Graphite Iron Cast, not only the application to Fujian Province's local cast iron has directive significance, and the application that ground such as Guangdong, Jiangxi contain the arsenic local cast iron is also had directive significance.

Description of drawings:

Fig. 1 is a process route chart of the present invention.

Embodiment:

The present invention is on the basis of research lead, arsenic, tin alienation behavior in cast iron, with Fujian Province's local cast iron---Longyan pig iron is main raw material(s) melting molten iron, molten iron melting in the 20Kg100KW medium-frequency induction furnace, and adding alloying element in stove and in the bag respectively, chemical ingredients of the present invention is: 2.9～3.5%C; 2.4～3.6%Si; 0.7～0.9%Mn; ≤ 0.095%P; ≤ 0.04%S; 0.003～0.008%Pb; 0.02～0.07%As; 0.08～0.4%Sn; 0.1～0.3%Al; 0.07～0.10%Ti; All the other are Fe.In metal mold, carry out the test of producing of D type Graphite Iron Cast.L is adopted in test ₉(3 ⁴) the positive quadraturing design test method draws up a plan for and study, its four factors are respectively: titanium add-on, Si/C, innoculant adding quantity and aluminium add-on.Carbon equivalent is fixed on hypoeutectic or the eutectic level, change Si/C, mix potent nucleating agent with Longyan pig iron---the baric ferrosilicon effectively breeds, utilize the alloying element aluminium that adds, the compound action of titanium, produce leaded, arsenic, tin D type Graphite Iron Cast very successfully, and obtained best test conditions combination.

Utilizing Fujian Province's local cast iron---the tissue signature of prepared this leaded, the arsenic of Longyan pig iron, tin D type Graphite Iron Cast is: tiny dendrite point graphite+perlite and ferrite mixed matrix, its σ _bBring up to 266～375Mpa from 200Mpa, than the A type graphite cast iron raising 18～70% of close composition; The D type Graphite Iron Cast has reasonable antioxidant property again simultaneously, and 600 ℃ of following oxidation weight gains are from 2.197mg/cm ²Be reduced to 0.965～0.778mg/cm ²900 ℃ of following oxidation weight gains are from 3.724mg/cm ²Be reduced to 3.109～2.709mg/cm ², improved 27～64%.

Claims (1)

1, a kind of leaded, arsenic, tin D type Graphite Iron Cast, it is characterized in that: it comprises following chemical components and weight percent:

Carbon C 2.9～3.5%; Silicon Si 2.4～3.6%;

Manganese Mn 0.7～0.9%; Phosphorus P≤0.095%;

Sulphur S≤0.04%; Plumbous Pb 0.003～0.008%;

Arsenic As 0.02～0.07%; Tin Sn 0.08～0.4%;

Aluminium Al 0.1～0.3%; Titanium Ti 0.07～0.10%;

All the other are Fe.

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