Abstract: N'ebe a na-arụnye nkwonkwo mgbasawanye, enwere ike imezi ya dị ka mkpa dị iche iche si dị. Otú ọ dị, n'ihe gbasara ọrụ ya, mgbatị ahụ nwere ike ịmegharị ike axial n'ime usoro ọkpọkọ dum. Ihe ndị bụ isi nke nkwonkwo mgbasawanye gụnyere gụnyere. QT-400, Q235A, HT20, 304L, 316L ...
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