He mea paipu kila ka P235TR1 nona ka hoʻohui kemika e kūlike me ke kūlana EN 10216-1.hale hana kemika, nā moku, ke kūkulu ʻana i nā paipu a no nā mea maʻamaunā kumu hana ʻenekinia mīkini.

Wahi a ke kūlana maʻamau, ʻo ka hoʻohuihui kemika o P235TR1 e komo pū ana me ka nui o ke kalapona (C) a hiki i ka 0.16%, ka nui o ka silicon (Si) a hiki i ka 0.35%, ka nui o ka manganese (Mn) ma waena o 0.30-1.20%, ka nui o ka phosphorus (P) a me ka sulfur (S). ʻO ka nui loa he 0.025% kēlā me kēia. Eia kekahi, e like me nā koi maʻamau, hiki i ka hoʻohuihui o P235TR1 ke loaʻa nā nui liʻiliʻi o nā mea e like me ka chromium (Cr), ke keleawe (Cu), ka nickel (Ni) a me ka niobium (Nb). Hiki i ka kaohi ʻana i kēia mau hoʻohuihui ke hōʻoia i ka loaʻa ʻana o nā paipu kila P235TR1 i nā waiwai mechanical kūpono a me ke kūpaʻa i ka pala, e kūpono ai no ka hoʻohana ʻana i kekahi mau noi ʻoihana kikoʻī.

Mai kahi kuanaʻike o ka hoʻohuihui kemika, ʻo ka haʻahaʻa o ke kalapona o P235TR1 e kōkua i ka hoʻomaikaʻi ʻana i kona hiki ke hoʻopili ʻia a me ke kaʻina hana, a ʻo kona ʻano silicon a me manganese e kōkua i ka hoʻomaikaʻi ʻana i kona ikaika a me ke kūpaʻa i ka pala. Eia kekahi, pono e kāohi ʻia ka nui o ka phosphorus a me ka sulfur ma nā pae haʻahaʻa e hōʻoia i ka maʻemaʻe o ka mea a me ka hiki ke kaʻina hana. ʻO ke alo o nā mea trace e like me chromium, keleawe, nickel a me niobium e loaʻa ka hopena i kekahi mau waiwai o nā paipu kila, e like me ke kūpaʻa wela a i ʻole ke kūpaʻa i ka pala.

Ma waho aʻe o ke ʻano kemika, ʻo ke kaʻina hana, nā ʻano hana wela a me nā ʻano hana kino ʻē aʻe o ka paipu kila P235TR1 he mau mea nui hoʻi e pili ana i kāna hana hope loa. Ma keʻano laulā, ʻo ke ʻano kemika o ka paipu kila P235TR1 kekahi o nā mea nui e hōʻoia ai e hoʻokō ia i nā koi o nā kūlana pili a hiki ke hoʻokō i nā kumu ʻenekinia kikoʻī.