Hiki ke hoʻokaʻawale ʻia ke kila i ke kila kalapona haʻahaʻa, ke kila kalapona kiʻekiʻe.ʻO ke kila kalapona haʻahaʻa - ʻoi aku ka liʻiliʻi o ka maʻi kalapona ma mua o 0.25%;kila kalapona maʻamau - ma waena o 0.25 a me 0.60% ka nui o ke kalapona;ke kila kalapona kiʻekiʻe - ʻoi aku ka nui o ka ʻike kalapona ma mua o 0.60%.
Mana hoʻokō: koʻu ʻāina Taiwan CNS helu kila maʻamau S20C, German DIN maʻamau mea helu 1.0402, German DIN helu kila maʻamau CK22/C22.Pelekania BS kila helu helu IC22, Palani AFNOR helu kila maʻamau CC20, Palani NF kila maʻamau helu C22, Italian UNI kila maʻamau helu C20/C21, Belgium NBN kila maʻamau helu C25-1, Suedena SS maʻamau kila helu 1450, Sepania UNE kila maʻamau No. F.112, American AISI/SAE kila maʻamau No. 1020, Japanese JIS kila kila No. S20C/S22C.
Huina kemika: Carbon C: 0.32～0.40 Silikino Si: 0.17～0.37 Manganese Mn: 0.50～0.80 Sulfur S: ≤0.035 Phosphorus P: ≤0.035 Chromium Cr: ≤0.25 Nikela Cu: 2. : Ka ikaika tensile σb (MPa): ≥530 (54) Ka ikaika hua σs (MPa): ≥315 (32) Elongation δ5 (%): ≥20 Ka emi ʻana o ka wahi ψ (%): ≥45 Impact energy Akv (J): ≥ 55 hopena ikaika waiwai αkv (J/cm²): ≥69 (7) ʻOoleʻa: wela ʻole ≤197HB Ka nui laʻana: ʻo 25mm ka nui o ka laʻana.
