ʻO Q345 kahi mea kila.He kila haʻahaʻa haʻahaʻa (C<0.2%), hoʻohana nui ʻia i ke kūkulu ʻana, nā alahaka, nā kaʻa, nā moku, nā moku kaomi, a me nā mea ʻē aʻe. ʻO Q ke hōʻike nei i ka ikaika o kēia mea, a ʻo ka 345 e pili ana i ka waiwai o kēia. mea, ma kahi o 345 MPa.A e emi ana ka waiwai o ka hua me ka hoʻonui o ka mānoanoa mea.
Loaʻa i ka Q345 nā waiwai mechanical piha maikaʻi, ʻae ʻia ka haʻahaʻa haʻahaʻa haʻahaʻa hana, ka plasticity maikaʻi a me ka weldability, a hoʻohana ʻia e like me nā hale, nā ʻāpana mechanical, nā hale kūkulu hale, nā ʻāpana ʻāpana metala, wela a i ʻole maʻamau, hiki ke hoʻohana ʻia i nā hale like ʻole i nā ʻāina anu ma lalo. -40°C.
Hoʻokaʻawale
Q345 hiki ke maheleia i Q345A,Q345B, Q345C, Q345D, Q345E e like me ka papa.ʻO kā lākou mea e hōʻike ai ʻo ia ka wela o ka haʻalulu.
Q345A pae, ʻaʻohe hopena;
Q345B pae, 20 degere ka hopena wela maʻamau;
Q345C pae, he 0 degere ka hopena;
Q345D pae, he -20 degere ka hopena;
ʻO ka pae Q345E, he -40 degere ka hopena.
Ma nā mahana hoʻohāhā like ʻole, ʻokoʻa nā waiwai haʻalulu.
haku mele
Q345A:C≤0.20,Mn ≤1.7，Si≤0.55，P≤0.045，S≤0.045，V 0.02~0.15；
Q345B:C≤0.20，Mn ≤1.7，Si≤0.55，P≤0.040，S≤0.040，V 0.02~0.15；
Q345C:C≤0.20，Mn ≤1.7，Si≤0.55，P≤0.035，S≤0.035，V 0.02~0.15，Al≥0.015；
Q345D:C≤0.20，Mn ≤1.7，Si≤0.55，P≤0.030，S≤0.030，V 0.02~0.15，Al≥0.015；
Q345E:C≤0.20，Mn ≤1.7，Si≤0.55，P≤0.025，S≤0.025，V 0.02~0.15，Al≥0.015；
vs. 16Mn
ʻO ke kila Q345 kahi mea pani no nā mea kila kahiko o 12MnV, 14MnNb, 18Nb, 16MnRE, 16Mn a me nā ʻano kila ʻē aʻe, ʻaʻole ia he pani no ke kila 16Mn.Ma ke ʻano o ka haku mele, ʻokoʻa ka 16Mn a me Q345.ʻO ka mea nui, aia kahi ʻokoʻa nui i ka nui o ka pūʻulu mānoanoa o nā kila ʻelua e like me ka ʻokoʻa i ka ikaika o ka hoʻoulu ʻana, a ʻo kēia ka mea e hoʻololi i ke koʻikoʻi ʻae ʻia o nā mea me kekahi mau mānoanoa.No laila, ʻaʻole kūpono ka hoʻopili wale ʻana i ke koʻikoʻi ʻae ʻia o ke kila 16Mn i ke kila Q345, akā pono e hoʻoholo hou ʻia ke koʻikoʻi e like me ka nui o ka hui mānoanoa kila.
ʻO ka māhele o nā mea nui o ke kila Q345 ka mea like me ke kila 16Mn, ʻo ka ʻokoʻa ke hoʻohui ʻia nā mea hoʻohui o V, Ti a me Nb.Hiki ke hoʻomaʻemaʻe i ka palaoa, hoʻomaikaʻi maikaʻi i ka paʻakikī o ke kila, a hoʻomaikaʻi maikaʻi i nā waiwai mechanical piha o ke kila.Ma muli o kēia e hiki ai ke hoʻonui i ka mānoanoa o ka pā kila.No laila, pono e ʻoi aku ka maikaʻi o nā mea mechanical piha o ke kila Q345 ma mua o ke kila 16Mn, ʻoi aku ka nui o kāna hana haʻahaʻa haʻahaʻa ʻaʻole i loaʻa i ke kila 16Mn.ʻOi aku ka kiʻekiʻe o ke koʻikoʻi o ke kila Q345 ma mua o ke kila 16Mn.
hoʻohālikelike hana
Q345Dpaipu lauwilinā waiwai mechanical:
Ka ikaika tensile: 490-675 Ka ikaika hua: ≥345 Elongation: ≥22
Q345Bpaipu lauwilinā waiwai mechanical:
Ka ikaika tensile: 490-675 Ka ikaika hua: ≥345 Elongation: ≥21
Q345A paipu holoʻokoʻa mechanical waiwai:
Ka ikaika tensile: 490-675 Ka ikaika hua: ≥345 Elongation: ≥21
Q345C paipu holoʻokoʻa mechanical waiwai:
Ka ikaika tensile: 490-675 Ka ikaika hua: ≥345 Elongation: ≥22
Q345E paipu holoʻokoʻa mechanical waiwai:
Ka ikaika tensile: 490-675 Ka ikaika hua: ≥345 Elongation: ≥22
Huahana Huahana
Ke kila Q345D i hoʻohālikelike ʻia me ke kila Q345A, B, C.Haʻahaʻa ka wela hoʻāʻo o ka ikehu hopena haʻahaʻa.Hana maikaʻi.ʻOi aku ka liʻiliʻi o ka nui o nā mea ʻino P a me S ma mua o ka Q345A, B a me C. ʻOi aku ke kumu kūʻai ma mua o Q345A, B, C.
Wehewehe o Q345D:
① Hoʻokumu ʻia me ka helu Q + + hōʻailona māka maikaʻi + hōʻailona ala deoxidation.ʻO kona helu kila ma mua o ka "Q", e hōʻike ana i ka helu hua o ke kila, a ʻo ka helu ma hope o ia e hōʻike ana i ka waiwai o ka helu hua ma MPa.No ka laʻana, hōʻike ʻo Q235 i ke kila hana kalapona me kahi kiko hua (σs) o 235 MPa.
②Inā pono, hiki ke kaha ʻia ka hōʻailona e hōʻike ana i ka pae maikaʻi a me ke ʻano deoxidation ma hope o ka helu kila.ʻO nā hōʻailona papa maikaʻi ʻo A, B, C, D.Hōʻailona ʻano Deoxidation: F ʻo ia hoʻi ke kila paila;b 'o ia hoʻi ke kila semi-pepehi ʻia;ʻO Z ke kila make;ʻO TZ ke kila kila kūikawā, a ʻaʻole hiki ke kaha ʻia ke kila i pepehi ʻia me nā hōʻailona, ʻo ia hoʻi, hiki ke waiho ʻia ʻo Z a me TZ.No ka laʻana, Q235-AF 'o ia hoʻi ka Grade A paila kila.
③ ʻO ke kila kalapona no nā kumu kūikawā, e like me ke kila alahaka, ke kila moana, a me nā mea ʻē aʻe, hoʻohana maʻamau i ke ʻano hōʻike o ke kila structural carbon, akā ua hoʻohui ʻia ka leka e hōʻike ana i ke kumu ma ka hope o ka helu kila.
Mea hoʻolauna
| ʻeleʻele | C≤ | Mn | Si≤ | P≤ | S≤ | Al≥ | V | Nb | Ti |
| maʻiʻo | 0.2 | 1.0-1.6 | 0.55 | 0.035 | 0.035 | 0.015 | 0.02-0.15 | 0.015-0.06 | 0.02-0.2 |
ʻO nā waiwai mechanical o Q345C penei (%):
| Helu kuhikuhi waiwai mechanical | Elongation(%) | ʻO ka mahana hoʻāʻo 0 ℃ | Ka ikaika uʻi MPa | Lae hua MPa≥ |
| waiwai | δ5≥22 | J≥34 | σb（470-650） | σs（324-259） |
Aia ka mānoanoa o ka pā ma waena o 16-35mm, σs≥325Mpa;i ka wā o ka pā mānoanoa ma waena o 35-50mm, σs≥295Mpa
2. Nā hiʻohiʻona welding o ke kila Q345
2.1 Ka helu ʻana o ke kalapona like (Ceq)
Ceq=C+Mn/6+Ni/15+Cu/15+Cr/5+Mo/5+V/5
E helu i ka Ceq = 0.49%, ʻoi aku ka nui ma mua o 0.45%, hiki ke ʻike ʻia ʻaʻole maikaʻi loa ka hana kuʻi ʻana o ke kila Q345, a pono e hoʻokumu ʻia nā ʻenehana koʻikoʻi i ka wā welding.
2.2 Hiki mai nā pilikia ma ke kila Q345 i ka wā wili
2.2.1 ʻO ke ʻano paʻakikī i ka ʻāpana wela
I ka wā o ka wili a me ka hoʻoluʻu ʻana o ke kila Q345, ua maʻalahi ka hoʻokumu ʻia ʻana o ka martensite i hoʻopau ʻia i loko o ka wahi i hoʻopilikia ʻia i ka wela, kahi e hoʻonui ai i ka paʻakikī a hoʻemi i ka plasticity o ka wahi kokoke-seam.ʻO ka hopena he māwae ma hope o ka wili.
2.2.2 Ka naʻau māwae anu
ʻO nā māwae kuʻihao o ke kila Q345 he mau māwae anu.
Ka manawa hoʻouna: Mar-20-2023