Nūhou - ʻO nā Coils Steel Hot-rolled: ʻO ke kumu nui o ke kahua ʻoihana

I loko o ka ʻōnaehana ʻoihana hou, ʻo nā wili kila wela ka mea maʻamau, a ʻo kā lākou ʻokoʻa o nā hiʻohiʻona a me nā ʻokoʻa hana e hoʻopili pololei i ke ala hoʻomohala o nā ʻoihana i lalo. ʻO nā hiʻohiʻona like ʻole o nā wili kila wela e pāʻani i kahi hana i hiki ʻole ke hoʻololi ʻia i ka hana o ke kūkulu ʻana, nā kaʻa kaʻa, ka ikehu, a me nā mea ʻē aʻe me kā lākou ʻano kemika kūikawā a me nā waiwai mechanical. E kālele ana nā mea aʻe i ka nānā ʻana i nā hiʻohiʻona wili kila wela me ka koi mākeke kiʻekiʻe loa a me kā lākou mau ʻokoʻa.

Ka Mana Nui: Q235B a me SS400
ʻO Q235B ka mea maʻamau i hoʻohana ʻia i ke kila haʻahaʻa haʻahaʻa haʻahaʻa ma Kina, me kahi maʻi kalapona ma kahi o 0.12% -0.20%, a he maikaʻi ka plasticity a me nā waiwai kuʻi. ʻO ≥235MPa kona ikaika hua a hoʻohana nui ʻia i ke kūkulu hale, nā kākoʻo alahaka a me nā ʻāpana mechanical maʻamau. I loko o ka ʻoihana hana, ʻoi aku ka nui o 60% i nā I-beams, nā ʻili a me nā mea kila ʻē aʻe i hana ʻia me ka Q235B hot-rolled coils, e kākoʻo ana i ka iwi o ke kūlanakauhale.
ʻO SS400 he kila kalapona i hoʻohana ʻia ma ke ao holoʻokoʻa me ka ikaika like me Q235B, akā ʻoi aku ka paʻa o ka sulfur a me ka phosphorus haumia a me ka maikaʻi o ka ʻili. Ma ke kahua o ka hana moku, hoʻohana pinepine ʻia nā coils wela wela SS400 no nā ʻāpana hana hull. ʻOi aku ka maikaʻi o kona pale ʻana i ka wai kai ma mua o ke kila kalapona maʻamau, e hōʻoia ana i ka palekana o nā holo moana.

Puʻupuʻu kila i ʻōwili ʻia - Royal Group

Nā Lunamakaʻāinana kiʻekiʻe: Q345B a me Q960
ʻO Q345B he kila ikaika kiʻekiʻe haʻahaʻa me 1.0% -1.6% manganese i hoʻohui ʻia, a ʻoi aku ka ikaika o ka hua ma luna o 345MPa. Hoʻohālikelike ʻia me Q235B, hoʻonui ʻia kona ikaika ma kahi o 50%, ʻoiai e mālama ana i ka weldability maikaʻi. Ma ka ʻenekinia alahaka, hiki i nā pahu pahu i hana ʻia me ka Q345B hot-rolled steel coils hiki ke hoʻemi i ke kaumaha ma 20%, e hōʻemi nui ana i nā kumukūʻai ʻenehana. I ka makahiki 2023, ʻoi aku ka nui o ka hana ʻana o ke alahaka kūloko ma mua o 12 miliona tons o Q345B hot-rolled coils, e helu ana no 45% o ka huina o kēia ʻano.
Ma ke ʻano he ʻelele maʻamau o ke kila ikaika ultra-kiʻekiʻe, loaʻa ʻo Q960 i ka ikaika hua o ≥960MPa ma o ka ʻenehana microalloying (hoʻohui i ka vanadium, titanium a me nā mea ʻē aʻe) a me nā kaʻina hana hoʻoluʻu hoʻomalu. Ma ke kahua o ka mīkini ʻenekinia, hiki ke hoʻemi ʻia ka mānoanoa o ka lima crane i hana ʻia i ka Q960 hot-rolled coil i lalo o 6mm, a hoʻonui ʻia ka hiki ke hoʻonui i nā manawa 3, e hāpai ana i ka hoʻomaikaʻi māmā ʻana o nā mea hana e like me nā excavators a me nā cranes.

Kūikawā Kūikawā: SPHC a me SAPH340
ʻO SPHC kahi huahana kiʻekiʻe ma waena o nā kila haʻahaʻa haʻahaʻa wela. Ma ka hoʻonui ʻana i ke kaʻina hana e hoʻomalu i ka nui o ka palaoa, ʻoi aku ka elongation ma mua o 30%. I loko o ka ʻoihana mea hana hale, hoʻohana ʻia nā wili wela SPHC e hana i nā hale compressor pahu hau. ʻO kāna hana kiʻi kiʻi hohonu e hōʻoia i ka helu kūpono o ka hoʻokumu ʻana o ka ʻili curved paʻakikī ma mua o 98%. I ka makahiki 2024, e hoʻonui ʻia ka hoʻohana ʻana i nā coils wela SPHC i loko o ke kula ʻoihana home home e 15% i kēlā me kēia makahiki i ka 3.2 miliona tons.
Ma ke ʻano he kila kaʻa kaʻa, loaʻa ka SAPH340 i kahi kaulike ma waena o ka ikaika a me ka paʻakikī ma ka hoʻohui ʻana i ka 0.15% -0.25% kalapona a me ka trace boron. I ka hana ʻana i nā pahu pākaukau kaʻa kaʻa hou, hiki i ka SAPH340 hot-rolled coils ke kūpaʻa i nā ukana hoʻoikaika ʻoi aku ma mua o 500MPa a hoʻokō i nā koi o nā kaʻina hana wili. I ka makahiki 2023, ua hiki i ka 70% o nā ʻāpana hana pākaukau ka nui o nā coils wela wela o kēia ʻano i hoʻohana ʻia i nā kaʻa ʻenehana hou.

Hoʻohālike	Ka ikaika hua (MPa)	Elongation (%)	Nā hiʻohiʻona noi maʻamau
Q235B	≥235	≥26	Nā hale kūkulu hale, nā mīkini maʻamau
Q345B	≥345	≥21	Alahaka, moku kaomi
SPHC	≥275	≥30	Nā lako hale, nā ʻāpana kaʻa
Q960	≥960	≥12	ʻO nā mīkini ʻenekinia, nā mea hana kiʻekiʻe