含ボロンばね鋼 TS50 B60 に関する研究 (I)
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It is reported by American investigators that B-treated Cr steel TS50B60 showed very good results for leaf or coil spring material of trucks, tractors and passenger cars. But in our country there is few data about this steel, and so the authors studied the properties of TS50B60 in comparision with SUP 6 (Si-Mn steel), SAE 5160 (Mn-Cr steel) and SAE 6150 (Cr-V steel) as minutely as possible. Results of the studies were as follows : 1) Non-metallic inclusions. There was little difference between different steels and so the influence of B-addition was not found. 2) Transformation points. High temperature order was as follows : A_1 point : SAE6150>SAE5160≒SUP6>TS50B60 A_3 point : SAE6150>SAE5160>TS50B60≒SUP6 3) Hardenability. D_1, calculated from the measured Jominy curves, were 115mm for SAE6150, 100mm for SAE 5160, 97mm for TS50B60 and 53mm for SUP 6. The fading phenomena of B were not seen. The results of dilatometric observation at quenching were as same as above. 4) Tendency of quenching cracks. The residual stress of quenched specimen showed the transformation type for different steels and had good coincidence with the tendency of quenching cracks that is in next order, SAE6150>SAE5160>TS50B60>SUP6. 5) Grain growth characteristics. Under 1050℃ there was no marked difference and above this temperature grain growth became eminent, but TS50B60 was the most stable. 6) Decarburization, scaling and surface roughness at heating. Decarburization depth was greatest at SUP 6 and became smaller in the next order, SAE6150>SAE5160>TS50B60, but the tendency of scaling showed the inverse order to above. Surface roughness was best at SUP 6 and worst at SAE5160.
- 社団法人日本鉄鋼協会の論文
- 1956-02-01
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