a Cu ≤ 0.50 %; Ni ≤ 0.50 %; Cr ≤ 0.50 % na Mo ≤ 0.15 %.

b Maka mbelata nke ọ bụla nke 0.01% n'okpuru ebe a kapịrị ọnụ maka carbon, mmụba nke 0.05% n'elu ntinye uche kachasị maka Mn kwere omume, ruo na 1.65% maka akara ule ≥ L245 ma ọ bụ B, mana ≤ L360 ma ọ bụ X52; ruo kacha nke 1.75% maka akara ule> L360 ma ọ bụ X52, mana <L485 ma ọ bụ X70; na ihe ruru 2.00% kacha maka ọkwa L485 ma ọ bụ X70.

c Ọ gwụla ma ekwenyeghị n'ụzọ ọzọ, Nb + V ≤ 0.06 %.

d Nb + V + Ti ≤ 0.15 %.

e Ọ gwụla ma ekwetaghị.

f Ọ gwụla ma ekwenyeghị n'ụzọ ọzọ, Nb + V + Ti ≤ 0.15 %.

g Ọnweghị ụma gbakwụnye nke B agaghị ekwe yana nke fọdụrụ B ≤ 0.001 %.

Ọkwa ọkpọkọ

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C bụ 1940 maka mgbako site na iji nkeji SI na 625,000 maka mgbako site na iji nkeji USC;

Axc bụ mpaghara cross-section test tensile na ọdabara, nke akọpụtara na milimita square (square inch), dị ka ndị a:

1) maka mpempe ule okirikiri okirikiri, 130 mm2 (0.20 in.2) maka 12.7 mm (0.500 in.) na 8.9 mm (0.350 in.) mpempe ule dayameta; 65 mm2 (0.10 in.2) maka 6.4 mm (0.250 in.) mpempe ule dayameta;

2) n'ihi na zuru-ngalaba ule iberibe, ndị nta nke a) 485 mm2 (0.75 in.2) na b) cross-section ebe nke ule ibe, ewepụtara site na iji kpọmkwem n'èzí dayameta na kpọmkwem mgbidi ọkpụrụkpụ nke ọkpọkọ, gbara gburugburu na 10 mm2 kacha nso (0.01 in.2);

3) maka mpempe ule warara, nke pere mpe nke a) 485 mm2 (0.75 in.2) na b) mpaghara obe nke mpempe ule, ewepụtara site na iji obosara akọwapụtara nke mpempe ule na ọkpụrụkpụ mgbidi akọwapụtara nke ọkpọkọ. , gbara gburugburu na 10 mm2 kacha nso (0.01 in.2);

U bụ ike tensile kacha nta akọwapụtara, gosipụtara na megapascals (paụnd kwa square inch).