CN102312170A

CN102312170A - Martensite wear-resistant cast steel

Info

Publication number: CN102312170A
Application number: CN2010102241678A
Authority: CN
Inventors: 朱增军; 蒋正军; 沈桂林
Original assignee: TAIZHOU HUINENG STAINLESS STEEL PRODUCT CO Ltd
Current assignee: TAIZHOU HUINENG STAINLESS STEEL PRODUCT CO Ltd
Priority date: 2010-07-06
Filing date: 2010-07-06
Publication date: 2012-01-11

Abstract

The invention discloses martensite wear-resistant cast steel. The martensite wear-resistant cast steel comprises the following components in percentage by weight: 0.35 to 0.55 percent of C, 0.75 to 1.25 percent of Si, less than or equal to 0.035 percent of P, less than or equal to 0.03 percent of S, 0.95 to 2.20 percent of Mn, 1.95 to 2.95 percent of Cr, 0.15 to 0.22 percent of Mo, and the balance of inevitable impurities and Fe. The martensite wear-resistant cast steel meets the wear-resisting requirement and has the characteristics of high impact toughness and intensity, initial hardness, and yield strength and is not easy to deform.

Description

Martensite wear resistant cast steel

Technical field

The present invention relates to metal material field, particularly a kind of middle carbon multi-element low alloy martensite wear resistant cast steel that receives medium impact that is applicable to.

Background technology

Mostly the carbon and low-alloy martensite wear resistant cast steel is that Cr, Mo or Cr, Mo, Ni are steel alloy in external at present, and thermal treatment process adopts to quench and adds the technology of low-temperaturetempering, to obtain HS, high firmness and certain flexible alloy property.Typical steel grade has the famous wear-resisting steel grade of the ESCO-12 of U.S. ESCO company series, and this steel grade is the bulk alloy element with Cr, Mo, Ni promptly, and the 30CrMoSi and the 30CrMoSi2 of U.S. HENSLY company also fall into the same category.The research of carbon and low-alloy wearable cast steel and application started from after the eighties in 20th century in China; A series of achievements have been obtained; Typical steel grade is 30CrMnSiMoNi and Cr5Mo steel; Also have now part producing producer from external introduced and independent development the production technology of 30CrMoSi and 30CrMoSi2, also putting forth effort for some time therebetween to have developed the Si, the Mn that meet China's alloy resource situation is steel alloy 30Si2Mn.People have recognized that gradually multi-element alloyed is the effective ways that improve wearable cast steel hardening capacity, obdurability and hardness now; Thereby both at home and abroad wearable cast steel adopts Cr, Mo, Ni, Si, Mn multi-element alloyed more; Research in recent years shows; Under the situation of the medium and small energy impact abrasive wear of opposing, high mangaenese steel is not wear-resisting.Adopt high mangaenese steel to make exactly like ball grinding machine lining board; Because the weave construction of high mangaenese steel is an austenite, hardness is lower, and wear resistance is relatively poor; Especially under the situation that does not stand severe impact; Can not get work hardening in short period of time, therefore cause the grinding initial stage rate of wear very fast, be merely about four months mean life.In addition, all there are the not attrition resistant problem of shock resistance difference in Medium Manganese Steel and other austenite cast steel.

In order to address the above problem, the patent No. is to disclose a kind of cast iron materials in the document of SU1650759, is made up of alloying elements such as C, Si, Mn, Cr, V, Ti, B, Ca, Al, Ce, Ba, and tensile strength is 710-750Mpa.Though this cast steel hardness is higher, wear resistance is better, and intensity is lower, can only under less shock load, work.In addition, because the chemical ingredients more complicated of this steel, the content of noble metal such as Cr is higher, not only causes costing an arm and a leg of steel, and alloying elements such as Ca, Ce, Ba are difficult to control in melting.In disclosed " a kind of wear-resisting casting " in disclosed a kind of " multicomponent microalloying bainitic steel " in the one Chinese patent application numbers 97105661.7, the one Chinese patent application numbers 96119545, the one Chinese patent application numbers 95106429 in disclosed a kind of " Mn-Si-Mo-B bainitic steel " Chinese patent numbers 93106429 disclosed a kind of " air-cooled bainite steel with high toughness and high quenching performance " and Chinese patent a kind of wearable cast steel in microalloy martensite and method of manufacture CN1600889A are disclosed, the mass percent of the basic Chemical Composition C of described wearable cast steel in microalloy martensite, Si, Mn, Cr, S, P is: C 0.25～0.34, Si 0.4～0.7, Cr 0.5～1.0, Mn 1.15～1.65, S≤0.035, P≤0.035; And having microelement Ti, RE, B, Al, the mass percent of described trace element is: B 0.0005～0.005, Ti 0.01～0.06, Ce 0.01～0.045, La 0.01～0.035, Al 0.01～0.1, all the other are Fe.Disclosed a kind of film austenic toughened martensite wear resistant cast steel of Chinese patent and method of manufacture CN1718829A thereof is characterized in that it has basic alloys Elements C, Si, Mn, Cr, microalloy element B, i, RE, Fe, and impurity element S, P; Specifically consist of: C:0.25～0.34wt%, Si:1.45～2.05wt%, Mn:0.90～1.20wt%; Cr:1.80～2.50wtB:0.0005～0.005wt%, Ti:0.01～0.06wt%, RE:0.015～0.08wt%; Al:0.015～0.06wt%; S≤0.035wt%, P≤0.035wt%, surplus is Fe.Chinese patent discloses a kind of wearable cast steel and preparation method thereof CN1560311A; Contain carbon, silicon, manganese, nickel, chromium and molybdenum element, it is characterized in that: the weight percent of trace element consists of C 0.2-0.35, Si 0.6-1.0, Mn 0.8-1.2, Ni 0.2-0.6, Cr 0.6-1.2, Mo 0.15-0.35 in the wearable cast steel.Etc. multinomial patent of invention, in actual casting, be prone to produce hot tearing and cold cracking, there is the not attrition resistant problem of shock resistance difference, work-ing life is short.

Summary of the invention

The purpose of this invention is to provide a kind of can either satisfy wear-resistingly have again than high impact toughness and intensity, the foundry goods initial hardness is high, ys is high, the martensite wear resistant cast steel of yielding fracture not.

The present invention realizes through following technical scheme: martensite wear resistant cast steel, comprise carbon, silicon, phosphorus, sulphur, manganese, chromium, molybdenum, iron, and its weight percent is C:0.35-0.55%; Si:0.75-1.25%, P :≤0.035%, S :≤0.03%; Mn:0.95-2.20%; Cr:1.95-2.95%, Mo:0.15-0.22%, surplus is unavoidable impurities and Fe.

Described high-strength abrasion-proof steel also comprises Ce, and its mass percent is 0.005-0.021%.

Among the present invention, the main effect of each alloying element is:

(1) carbon: then carbide quantity is many, hardness is high but toughness is low for the carbon height, easy fracture during use, and the low then toughness of carbon is high, hardness is low, is unfavorable for wear-resistingly, so carbon content is controlled at 0.35-0.55%.

(2) silicon: silicon can increase the temper resistance of steel, improves intensity and hardening capacity, and the silicon amount is too high, and impact toughness is unfavorable, so the selection silicone content is 0.75-1.25%.

(3) manganese: the element of strong stable austenite, significantly improve the hardening capacity of steel, increase wear resistance, reduce the tough brittle transition temperature of steel.But the too high impelling strength to steel of manganese is unfavorable, so manganese content is controlled at 0.95-2.20%.

(4) chromium: Cr is the main alloy element that improves steel hardenability, adds the Cr of 1.95-2.95% in the cast steel, can effectively improve the hardening capacity of steel, strengthens matrix.

(5) molybdenum: molybdenum can significantly improve the hardening capacity of steel, can also improve the solidifiability of cast steel, and molybdenum belongs to noble metal, so be chosen in 0.15-0.22%.

(6) sulphur, phosphorus: content is controlled at P respectively :≤0.035%, and S :≤0.03%;

(7) rare earth element ce effective refined cast structure not only; Purify crystal boundary; Improve the form and the distribution of carbide and inclusion; Improve the anti-fatigue performance and the antistrip performance of low-alloy wear-resistant steel, also can make low-alloy wear-resistant steel keep enough toughness so select rare earth at 0.005-0.021%.

Compared with prior art; The invention has the advantages that: 1. do not use the valuable alloying element of Ni; And the molybdenum that is to use trace improve steel hardening capacity, improve the solidifiability of cast steel, reach highly malleablized and hard malleableize purpose through microalloying, thereby manufacturing cost is lower.

Embodiment

Embodiment 1: a kind of martensite wear resistant cast steel, comprise carbon, silicon, phosphorus, sulphur, manganese, chromium, molybdenum, cerium, iron, and its weight percent is: C:0.402%; Si:0.86%, P:0.022%, S:0.015%; Mn:1.21%, Cr:1.95%, Mo:0.201%; Ce:0.0066%, surplus is unavoidable impurities and Fe.

Embodiment 2: a kind of martensite wear resistant cast steel, comprise carbon, silicon, phosphorus, sulphur, manganese, chromium, molybdenum, cerium, iron, and its weight percent is: C:0.55%; Si:0.77%, P:0.024%, S:0.012%; Mn:2.20%, Cr:2.96%, Mo:0.201%; Ce:0.011%, surplus is unavoidable impurities and Fe.

Embodiment 3: a kind of martensite wear resistant cast steel, comprise carbon, silicon, phosphorus, sulphur, manganese, chromium, molybdenum, cerium, iron, and its weight percent is: C:0.37%; Si:1.23%, P:0.020%, S:0.004%; Mn:1.00%, Cr:2.00%, Mo:0.196%; Ce:0.02%, surplus is unavoidable impurities and Fe.

Embodiment 4: a kind of martensite wear resistant cast steel, comprise carbon, silicon, phosphorus, sulphur, manganese, chromium, molybdenum, cerium, iron, and its weight percent is: C:0.36%; Si:1.20%, P:0.021%, S:0.0038%; Mn:1.01%, Cr:2.01%, Mo:0.200%; Ce:0.021%, surplus is unavoidable impurities and Fe.

Embodiment 5: a kind of martensite wear resistant cast steel, comprise carbon, silicon, phosphorus, sulphur, manganese, chromium, molybdenum, cerium, iron, and its weight percent is: C:0.365%; Si:1.21%, P:0.023%, S:0.0042%; Mn:1.00%, Cr:2.00%, Mo:0.204%; Ce:0.02%, surplus is unavoidable impurities and Fe.

The high-strength abrasion-proof steel that the present invention produces is the check of Stainless Steel Products quality supervision and test center through Jiangsu Province, its maximum, force Fm10.96KN, tensile strength Rm872.21MPa, lower yield strength ReL562.63MPa, relative reduction in area Z100%, the rate elongation 38% of having no progeny.

Embodiment is just for the ease of understanding technical scheme of the present invention; Do not constitute restriction to protection domain of the present invention; Every interior any simple modification, equivalent variations and modification of perhaps according to technical spirit of the present invention above scheme being done that does not break away from technical scheme of the present invention all still belongs within the protection domain of the present invention.

Claims

1. martensite wear resistant cast steel comprises carbon, silicon, phosphorus, sulphur, manganese, chromium, molybdenum, iron, and its weight percent is: C:0.35-0.55%; Si:0.75-1.25%, P :≤0.035%, S :≤0.03%; Mn:0.95-2.20%; Cr:1.95-2.95%, Mo:0.15-0.22%, surplus is unavoidable impurities and Fe.

2. martensite wear resistant cast steel according to claim 1 is characterized in that: also comprise Ce, its mass percent is 0.005-0.021%.