The influence of chromic nickel content to ZG32CrNiMo function

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Summary: ZG32CrNiMo is not existing brand, through content of Cr, Ni is being adjusted to make in fusion process ZG32CrNiMo classics differs the index such as the hardness after heat treatment and microtherm concussion tenacity obtains part of 3 kinds of different borer enlist in army conditional requirement. Keyword: ZG32CrNiMo obdurability low temperature pounds tenacity some company accepts 1 foreword order for goods of spare parts of export drilling machine, in all 3 kinds of spare partses, requirement material is ZG32CrNiMo, among them) of ℃ of K>15 J/cm2(-20 of HB 480-520 of hardness of requirement of spare parts Ⅰ , α ; ) of ℃ of K >20 J/cm2(-20 of HB 270-320 of requirement of spare parts Ⅱ , α ; ) of ℃ of K >20 J/cm2(-20 of HB 229-285 of requirement of spare parts Ⅲ , α . ZG32CrNiMo is not existing brand, contract requirement ZG32CrNiMo adds C by 20CrNiMo and adjust content of Cr, Ni appropriately and. The article chooses each element content through experiment actor, the design gives a kind of alloy, via different heat treatment its function can achieve the contract requirement of 3 kinds of afore-mentioned products at the same time. A of fusion of 2 sample design, B, C3 is planted the alloy of composition, alloy A maintains the alloying element content of 20CrNiMo, add C content to 0 only.

33 % , alloy B and alloy C are divided add C content to 0.

Outside 33 % , change content of Cr, Ni respectively. Alloy B design is tall Cr composition, cr content comes 0.

92 % ; Alloy C design is tall Ni composition, ni content comes 0.

95 % ; Composition of other and main alloy keeps changeless like Mo, Mn. The classics after fusion chemical analysis, each alloy composition sees a table 1. Alloy first mould becomes standard test block, rework pounds sample than V breach into standard summer. Method of the 3 experiments between train of temper by dipping in water and result 3. 1 quench ZG32CrNiMo is not had in because have a name,experimenting this one brand, have a name via consulting, ZG30CrNiMo is close to ZG32CrNiMo most, quench temperature is 850 ℃ formerly: , can push those who know ZG32CrNiMo to quench temperature should be between 900 ℃ of 800 ~ , it is between 895 ℃ of 825 ~ , every other 10 ℃ quench as temperature, in all 8 temperature undertake quenching experimenting, quench hardness is like a watch 2 reach the graph is shown 1 times. Graph 1 show: Of 3 alloy quench hardness peak value is in 855 ℃ . Because this chooses 855 ℃ ,quench have the test below. 3. 2 quench temper experiment uses 855 ℃ to be planted to A, B, C3 alloy undertakes quenching, in 200 ℃ ~ inside 700 ℃ interval, chose 11 temper temperature to undertake temper experiments, temper hardness sees a table 3 reach a figure 2. 3. 3 low temperature pound test sample to quench in 855 ℃ , be in respectively 200, 250, 300, 350, 400, 500, 600 ℃ temper, temper hind puts sample into filling the vacuum flask that has alcohol, join liquid nitrogen slowly, arrive when thermal drop - when 23 ℃ , the affiliation that controls liquid nitrogen is measured, maintain constant temperature, heat preservation after ten minutes take out sample quickly to undertake pounding an experiment, if test result is expressed 4 reach a figure 3. 4 results are analysed by quench hardness sees 3 kinds of alloy all reach maximum in 855 ℃ , it is HRC56 respectively.

8HRC56.

9, HRC56.

7 differ not quite, by concussion tenacity result is seen, the alloy C tenacity of tall Ni content is apparent A of prep above alloy, B, in 350 ℃ 3 kinds of alloy all produce temper brittleness, the concussion tenacity that before this 300 ℃ temper has alloy C only (α K =16.

1The requirement that J/cm2) achieves spare parts Ⅰ (15 J/cm2) of α K ≥ , in this temperature temper, the hardness of alloy C is HB 495, the hardness of Ⅰ of contented also spare parts (HB 480-520) requirement. Alloy C is in temper of 600 ℃ above, ≥ of K of concussion tenacity α 21.

9J/cm2, the requirement that can satisfy spare parts Ⅱ and Ⅲ (20 J/cm2) of α K ≥ , and the hardness requirement that can achieve spare parts Ⅱ and Ⅲ respectively in 650 ℃ and 680 ℃ temper. Far outclass of this temper temperature 600 ℃ , this shows, alloy C quenchs in 855 ℃ , can satisfy spare parts Ⅰ , Ⅱ , Ⅲ respectively via different temperature temper enlist in army conditional requirement. And alloy A, B cannot satisfy 3 kinds of spare partses at the same time enlist in army requirement. Composition of 5 conclusion 1) is C-0.

33 % , Cr-0.

48 % , Ni-0.

95 % , Mo-0.

28 % , Mn-0.

The alloy classics of 66 % can satisfy spare parts of 3 kinds of rig at the same time after different heat treatment enlist in army requirement. 2) this alloy quenchs in 855 ℃ , 300 ℃ temper can satisfy HB 485-520 of hardness of spare parts Ⅰ , ℃ of 15 J/cm2(-20 of α K ≥ ) technical requirement. 3) this alloy quenchs in 855 ℃ , 650 ℃ temper can satisfy ℃ of 20 J/cm2(-20 of ≥ of K of HB 269-321 of hardness of spare parts Ⅱ , α ) technical requirement. 4) this alloy quenchs in 855 ℃ , 680 ℃ temper can satisfy ℃ of 20 J/cm2(-20 of ≥ of K of HB 229-285 of hardness of spare parts Ⅲ , α ) technical requirement. CNC Milling CNC Machining