Ci ob npaug chamfered steel pas nrig centerless sib tsoo cov pas nrig txias tua 12l14 hloov cov hlau

Qib: 12L14 Tso Txiav Hlau

Cov Khoom Lag Luam: Round pas nrig, hexagonal pas nrig, square pas, square pas, cov khoom siv puab

Dawb Txiav Hlau Rau Kev Siv

Siv raws li tig hlau, siv dav hauv cov txheej txheem.

Tshuaj lom neeg cov tshuaj:

Silicon Si: Txheej txheem

Manganese MN: 0.85 ~ 1.15

P: 0.04 ~ 0.09

Sulphur S: 0.26 ~ 0.35

Lead PB: 0.15 ~ 0.35

Cov Cuab Yeej Cuab Yeej Cuab Yeej

Elongation Δ5 (%): (kub dov) ≥22;

Ntu shrinkage (%): (kub dov) ≥36

Hardness: (Kub Rolling) ≤170HB;

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