CN1195031A - Casting heat-resisting Cr-Ni-W alloy - Google Patents

Abstract

A refractory cast Cr-Ni-W alloy contains such chemical components as C (0.44-0.50%), Si (0.90-1.50%), Mn (0.80-1.40%), Cr (21.00-25.00%), Ni (43.00-54.00%), W (4.00-6.00%), P (less than 0.035%), S (less than 0.03%), Nb (0.31-0.60%), Re (0.03-0.05), Ti (0.20-0.50%) and Fe (rest), and features high antioxidizing, anticorrosion and antideforming performance, moderate cost and long service life. It can be used for slide tracks of billet heater.

Description

A kind of casting heat-resisting Cr-Ni-W alloy

A kind of alloy, particularly a kind of casting heat-resisting Cr-Ni-W alloy.

Metal current press working enterprise, the pusher-type furnace of usefulness, its skid is a Refractoloy, the slideway of this material is anti-oxidant, anticorrosive, creep-resistant property is poor, and work-ing life is low, be not complementary with repairing the cycle in the process furnace, be forced to blowing out often and change slideway, thereby influenced production efficiency; China patent CN1066298A " nickel-base casting alloy ", CN1079995A " heat and corrosion resistant cast nickel-base alloy ", above both is contained the Co Chemical Composition, and Co costs an arm and a leg, and is difficult to large-scale popularization and is applied on the slideway.

Task of the present invention provides a kind of casting heat-resisting Cr-Ni-W alloy, is used to cast the slideway of pusher-type furnace furnace bottom, improves slideway work-ing life.

For achieving the above object, the solution of the present invention is: add tungsten, titanium, rare earth element on the basis of original Refractoloy, the Chemical Composition of design (Wt%) is:

0.44-0.50％C，0.90-1.50％Si，0.80-1.40％Mn，

21.00-25.00％?Cr，43.00-54.00％Ni，

4.00-6.00％W，≤0.035％P，≤0.03％S，

0.31-0.60％Nb，0.03-0.05％Re，0.20-0.50％Ti，

All the other Fe.

The foundation of this casting heat-resisting Cr-Ni-W alloy Chemical Composition design is:

This refractory alloy is an Austenitic, contains the Ni about 50% in the alloy, and contains the W about 5%, has extra high hot strength and anti-oxidant, anti-carburizing energy in 1000-1200 ℃ of scope.Under high temperature action, the σ phase do not occur, and the coefficient of expansion is also little.

Cr is an important element in the refractory alloy, has good anti-oxidant, anticorrosive and creep-resistant property under hot conditions; The carbide of Cr makes alloy strengthening, and general Cr is more than 20%, but surpasses 26% o'clock alloy structure instability, causes reducing product work-ing life, so Cr should be 21-26%.

Nb and C, N, O unit have extremely strong avidity, forms very stable separately compound, particularly very strong carbide; The main crystal grain thinning of Nb improves processing characteristics; The Nb anti intercrystalline corrosion has the particularly important effect; Nb has the effect that improves hot strength; Comprehensive above Nb content is that 0.31-0.60% is advisable.Ti is the strong carbide forming element and forms Ni ₃The Ti element, involutory gold utensil has strengthening effect, guarantees the hot strength and the enduring quality of alloy; Ti also has heat resistanceheat resistant and anti-sulphur corrosion effect, so composition is defined as 0.2-0.5%.

Re has the effect of the alloy of purification, gets rid of nonmetal oxide and sulfide, and has the deleterious effect of deoxidation and elimination P, S, and makes the inclusion balling size decreases, makes carbide be tending towards even.Re has alloying action, the energy crystal grain thinning, and anti intercrystalline corrosion helps improving the anti-oxidant and corrosion resistance of alloy; Re can make oxide compound be spherical, can improve the high-temp plastic of alloy.But the excessive dross that in the alloy casting process, easily produces of Re, the overslaugh cast is carried out smoothly, and Re content is no more than 0.05% and is advisable.

This alloy is suitable for vacuum and antivacuum electric arc furnace, induction furnace are smelted, and this alloy liquid phase line temperature is 1485 ℃, and solidus temperature is 1345 ℃.

A kind of casting heat-resisting Cr-Ni-W alloy advantage of the present invention is in sum: use to have good anti-oxidant, anticorrosive, anti-stress deformation performance in 1220-1250 ℃ of environment.Make skid product service life long, and cost is suitable.

Below in conjunction with practicing, the present invention is further described: this casting heat-resisting Cr-Ni-W alloy adopts antivacuum high frequency furnace to smelt, cast out 4 slideways, the furnace bottom that is installed in bar plate heating stove has an end of fire door, and extreme conditions is used down, alloy slideway of the present invention produces distortion hardly, flawless and fracture are compared with former alloy slideway, increase the service life 4 months, promptly improve life-span 30-40%, promptly reach a stove labour phase.

Its chemical ingredients is listed in the following table

Sequence number	Chemical Composition (Wt%)
												??C	??Si	??Mn	??Cr	??Ni	???W	???P	???S	??Nb	???Re	??Ti
	?1	?0.48	??1.14	?0.84	??22.46	45.30	??4.82	?0.032	?0.024	?0.36	?0.034												?0.29
?2												?0.45	??0.89	?0.92	??23.35	43.60	??5.01	?0.029	?0.018	?0.32	?0.031	?0.32
	?3	?0.50	??1.08	?1.16	??24.45	44.20	??5.78	?0.027	?0.015	?0.31	?0.032												?0.28
?4												?0.45	??0.94	?0.89	??23.22	43.80	??4.90	?0.028	?0.017	?0.33	?0.032	?0.30

Claims (1)

1, a kind of casting heat-resisting Cr-Ni-W alloy is characterized in that: Chemical Composition (Wt%) is:

0.44-0.50％C，0.90-1.50％Si，0.80-1.40％?Mn，

21.00-25.00％Cr，43.00-54.00％Ni，4.00-6.20％W，

≤0.035％P，≤0.03％S，0.31-0.60％Nb，

0.03-0.05%Re, 0.20-0.50%Ti, all the other Fe.