CN103981454B

CN103981454B - A kind of thermostable antiwear oxidation resistant alloyed steel and manufacture method thereof

Info

Publication number: CN103981454B
Application number: CN201410194059.9A
Authority: CN
Inventors: 陈海波; 陈爱国; 陈仁训; 陈冰玲; 刘桂春; 陈春燕
Original assignee: Guo Gao Building Materials Science And Technology Ltd Of Nan'an
Current assignee: Huizhou Hao Metal Technology Co., Ltd.
Priority date: 2014-05-09
Filing date: 2014-05-09
Publication date: 2016-06-15
Anticipated expiration: 2034-05-09
Also published as: CN103981454A

Abstract

A kind of thermostable antiwear oxidation resistant alloyed steel, includes following alloying element according to mass percent: N:1-3%; C:0.1-0.3%; Si:0.5%; Mn:0.8～1.5%; Cr:18～25%; W :≤2.5%; Mo :≤1.5%; Co:0.2-0.5%; And W+Mo:4～6.0%; Nb :≤0.06%; Ta :≤0.15%; And Nb+Ta:0.05～0.15%; V:0.1～0.3%; N:0.03 ~ 0.05%; All the other are ferrum and inevitable impurity, and the present invention is made up of N, C, Si, Mn, P, S, Cr, Ni, Mo, V, W, Co, adopts aforementioned proportion of the present invention, and smelting is made. This product has stronger high temperature resistant, wear-resistant, antioxygenic property, is widely used in automobile, electric power, cement, petrochemical industry, space flight, the multiple field of aviation.

Description

A kind of thermostable antiwear oxidation resistant alloyed steel and manufacture method thereof

Technical field

The present invention relates to metallurgical technology field, particularly relate to a kind of thermostable antiwear oxidation resistant alloyed steel and manufacture method thereof.

Background technology

Steel is purposes a kind of material in all metals, in industrial circle extensive uses such as aviation, nuclear energy, naval vessel, petrochemical industry, in recent years to civil area development such as transportation (automobile, train), kitchen utensils, household electrical appliance, building decorations. Therefore, the performance of steel and the living safety of people are closely related. At present, the exploitation of auto industry steel is directed generally to improve the intensity of steel and keep its formability. Automobile light weight, safety, low energy consumption development trend steel products are proposed higher requirement in kind, specification, quality. Research and develop light weight, the new designing concept of impact-resistant means of transport system requires the material that mining inetesity is high, plasticity is good and energy absorption capability is excellent, specific mass is light. Improving intensity and can alleviate the weight (meeting energy-conserving and environment-protective demand) of automobile, plasticity raising then can meet complicated vehicle design and improve the demand driving security performance.

The research of potassium steel is with a long history with use, has good work hardening ability, thus potassium steel is widely used in the workpiece manufacturing anti impact wear-proof. In recent years, potassium steel is day by day paid attention in theoretical research and practical application. Potassium steel forms strain inducing twin because stable austenite is middle mutually and improves plasticity in deformation process. But in practice, it has been found that only when impacting greatly, stress being high, abrasive material is hard, the high-wearing feature of potassium steel is just embodied. The yield strength being additionally, since potassium steel is low, easily deformable during first use, and causes bigger abrasion; It addition, often there is potassium steel parts brittle fracture phenomenon in cold district; Therefore, how by suitable composition and Design Processing, by twin or phase transformation to improve the yield strength of potassium steel, improve its plastic deformation ability simultaneously, deflection when reducing first use and improve further potassium steel resistance to impact, wearability and become a new generation's car body materials, become the new problem of investigation of materials worker, also become one of study hotspot of metal material within the scope of our times.

In recent decades, the exploitation of abrasion-resistant stee is with application development quickly, general increase carbon content also adds appropriate trace element, such as chromium, molybdenum, nickel, vanadium, tungsten, cobalt, boron and titanium etc., make full use of the different schedule of reinforcement such as precipitation strength, refined crystalline strengthening, phase transformation strengthening and dislocation strengthening and improve the mechanical property of abrasion-resistant stees.Most of abrasion-resistant stees are middle carbon, medium high carbon and high-carbon steel, carbon content increase can cause that the toughness of steel declines, and the too high carbon severe exacerbation welding performance of steel, additionally, increasing alloy content can cause cost to improve and welding performance decline, and these shortcomings constrain the further development of abrasion-resistant stee. The wearability of material depends primarily on its hardness, and the wearability of material is also had very important impact by toughness. Only the hardness improving material does not ensure that material has preferably wearability and longer service life under complex working condition. By adjusting component and Technology for Heating Processing, control the Proper Match of low-alloy wear-resistant steel hardness and toughness, obtain excellent comprehensive mechanical performance so that it is meet the needs of different wear working condition.

The nitrogenous steel that super (super-) critical generating set high-pressure boiler tube is conventional is mainly P91, P92, it is characterized in high temperature resistant (593～610 DEG C), high pressure resistant (24～34MPa), for manufacturing the vitals such as the steam header of super (super-) critical unit plant boiler, power plant's main steam pipe, because station boiler works for a long time under high temperature, environment under high pressure, service condition is harsh, require the low gas of steel, high cleanliness. In order to meet requirement of strength, its standard regulation nitrogen content mass percent is 0.030～0.070%. The production method that usual P91, P92 steel adopts is to adopt to add nitrided ferro-chromium or nitrided ferromanganese or be blown into nitrogen at LF refining furnace to control 0.050～0.065% by the nitrogen content (mass percent) in molten steel, after VD application of vacuum, in molten steel, nitrogen content (mass percent) drops to 0.018～0.022%, denitrification percent is more than 60%, and (it is more high to be usually before VD application of vacuum in molten steel nitrogen content, after VD application of vacuum, denitrification percent is more high), it is impossible to meet high-pressure boiler tube standard-required. In ladle, only add nitrided ferro-chromium or nitrided ferromanganese or be blown into N Gas Alloying, making nitrogen content of molten steel reach the standard-required of 0.030～0.070%. But there is some problems in nitrogen pick-up again after VD application of vacuum: if with nitrided ferro-chromium or nitrided ferromanganese nitrogen pick-up after VD application of vacuum, the nitrogen content (mass percent) of general nitrided ferro-chromium or nitrided ferromanganese is 3～5%, nitrogenous ferroalloy addition is big, nonmetallic inclusionsin steel content and hydrogen, carrier of oxygen content will be increased, purity of steel is poor, product super (super-) critical generating set high-pressure boiler tube high cleanliness, low gas quality can not be met, the nitrogen-containing alloy amount being simultaneously introduced is big, and in steel, the uniformity of chemical composition can be affected. If VD after-blow N Gas Alloying, nitrogen increased amount is many, and the nitrogen flushing time is long, and ladle molten steel cooling is big, it is impossible to ensure the normal casting of molten steel.

Summary of the invention

It is an object of the invention to provide a kind of liquid steel temperature high, purity of steel is high, the smelting process of the high temperature high voltage resistant steel alloy that production cost is low.

A kind of thermostable antiwear oxidation resistant alloyed steel, the chemical composition of this material mixture ratio contains by weight percentage: N:1-3%; C:0.1-0.3%; Si:0.5%; Mn:0.8～1.5%; Cr:18～25%; W :≤2.5%; Mo :≤1.5%; Co:0.2-0.5%; And W+Mo:4～6.0%; Nb :≤0.06%; Ta :≤0.15%; And Nb+Ta:0.05～0.15%; V:0.1～0.3%; N:0.03 ~ 0.05%; Fe: surplus.

Preferably, in heat resisting steel, the percentage by weight of V is 0.15～0.3%.

Preferably, in described heat resisting steel, the percentage by weight of Mo is Mo :≤0.5%.

A kind of technological process producing thermostable antiwear oxidation resistant alloyed steel is as follows: vacuum induction melting → water injecting electrode → consumable electrode vacuum furnace remelting → high-temperature homogenization diffusion → forging is become a useful person → solution treatment → subzero treatment → dual Ageing Treatment; Described vacuum induction melting comprises the following steps:

(1) element except Cr is loaded crucible, crucible is preheated to 400～600 DEG C, and is evacuated to≤2.7Pa;

(2) melt with the burn-off rate of 5～10kg/min;

(3) after fine melt, carrying out refine with the temperature of 1560～1600 DEG C, the retention time is at 60～90min;

(4) add Cr, melt with the burn-off rate of 5～10kg/min;

(5) after Cr fine melt, again carrying out refine with the temperature of 1560～1600 DEG C, refining time controls at 20～30min.

Preferably, the molten speed of described consumable electrode vacuum furnace remelting is≤4.5kg/min, and keeps vacuum≤0.1Pa.

Preferably, the temperature of described high-temperature homogenization diffusion is 1200～1300 DEG C, and the time is >=20h.

Preferably, what described forging was become a useful person open, and forging temperature be >=1100 DEG C, stops forging temperature and is >=800 DEG C.

Preferably, described forging is become a useful person in step, and once, jumping-up is to the 40～60% of raw steel ingot height for steel ingot jumping-up.

Preferably, the heating-up temperature of described solution treatment is 1070～1100 DEG C, and temperature retention time is 0.5～2h, and then oil cooling is to room temperature.

The Advantageous Effects of the present invention is as follows: the present invention is made up of N, C, Si, Mn, P, S, Cr, Ni, Mo, V, W, Co, adopts aforementioned proportion of the present invention, and smelting is made. This product has stronger high temperature resistant, wear-resistant, antioxygenic property, is widely used in automobile, electric power, cement, petrochemical industry, space flight, the multiple field of aviation. Such as: CFBB power plant, cement industry and petrochemical industry. This product has a characteristic that

Contained by steel alloy, element is made up of N, C, Si, Mn, P, S, Cr, Ni, Mo, V, Co, W; 2, long-term under 1300 DEG C of hot environments, under flexural strength, 1300 DEG C of states of high temperature, without high-temerature creep phenomenon, elevated temperature strength is constant; 3, flow media is quartz sand, the marble of 20%, and the coal of 80% is at the temperature of 25.4 meter per second flow velocitys and 1100～1200 DEG C, and within every 100 hours, wear rate is 0.002 millimeter; 4, long-term at SO₂Or high-load O₂Under atmosphere, owing to the material surface that is added in of nitrogen constantly forms nitration case, therefore prevent the intercrystalline corrosion of metal; 5, solderability is good.

In the present invention, Cr, Ni, Co, Mo are the basic alloy elements realizing thermostability, content is if it exceeds scope of the present invention, steel alloy performance change can be caused, so that steel alloy fragility increases, W is another base metal element obtaining certain thermal coefficient of expansion, therefore its content is at least: 3%, but if it exceeds more than 5%, thermal coefficient of expansion will rise, and steel alloy presents embrittlement phenomenon, and therefore W should within the scope of 3-5%.

Detailed description of the invention

Embodiment 1

The present embodiment chemical composition (wt%) as shown in the table:

Element	C	Si	Mn	Nb	P	Cr	W	Mo	Co	Ta	N	V
													Content	0.2	0.50	1.10	0.02	0.03	20	2.5	1.0	0.3	0.03	2	0.2

(1) element except Cr is loaded crucible, crucible is preheated to 400 DEG C, and is evacuated to≤2.7Pa;

(2) melt with the burn-off rate of 5kg/min;

(3) after fine melt, carrying out refine with the temperature of 1560 DEG C, the retention time is at 60min;

(4) add Cr, melt with the burn-off rate of 5kg/min;

(5) after Cr fine melt, again carrying out refine with the temperature of 1560 DEG C, refining time controls at 20～30min.

Claims

1. a thermostable antiwear oxidation resistant alloyed steel, includes following alloying element according to mass percent:

N:1-3%; C:0.1-0.3%; Si:0.5%; Mn:0.8～1.5%; Cr:18～25%; W :≤2.5%; Mo :≤1.5%; Co:0.2-0.5%; And W+Mo=4; Nb :≤0.06%; Ta :≤0.15%; And Nb+Ta:0.05～0.15%; V:0.1～0.3%; All the other are ferrum and inevitable impurity; Described thermostable antiwear oxidation resistant alloyed steel is prepared by the following manner, comprises the following steps:

(1) element except Cr, Ta is loaded crucible, crucible is preheated to 600 DEG C, and is evacuated to≤3Pa;

(2) melt with the burn-off rate of 8～10kg/min;

(3) after fine melt, carrying out refine with the temperature of 1560～1600 DEG C, the retention time is at 80min;

(4) add Cr, melt with the burn-off rate of 8～10kg/min;

(5) after Cr, Ta fine melt, again carrying out refine with the temperature of 1560～1600 DEG C, refining time controls at 20～30min;

Dual Ageing Treatment comprises the following steps:

(1) by heat steel to 490～510 DEG C, after insulation 1～4h, oil cooling is to room temperature;

(2) steel are cooled to≤-73 DEG C, and after insulation 0.5～2h, air cooling is to room temperature;

(3) by heat steel to 470～490 DEG C, after insulation 10～15h, air cooling is to room temperature.