Dab tsi yog astm ib 178 cov khoom siv yeeb

Dab tsi yog ASTM 138 cov khoom siv yeeb nkab?

A178 Welded yeeb nkab hais txog kev ua kom tsis kam mus rau Welded Steel Yeeb Nkab uas ua raws li cov ANTM A178 / A178m txheem. Nws yog yog ua los ntawm cov roj carbon hlau lossis cov roj carbon manganese thiab yog siv tshwj xeeb siv cov dej sov, cov teeb meem superHeater super, thiab xaus kev nyab xeeb.

Cov tshuaj lom neeg muaj pes tsawg leeg ntawm A178 Welded yeeb nkab?

• Cov pa roj carbon (c): tsawg dua los yog sib npaug rau 0.25%, txo qhov kev pheej hmoo ntawm kev tawg txias;
• Manganese (mn): 0.80% -1.20%, txhim kho kom muaj zog thiab muaj zog;
• Phosphorus (P) / Sulfur (s): tsawg dua lossis sib npaug rau 0.040%, nruj me ntsis tswj cov impurities kom tiv thaiv brittleness;
• Silicon (si): tsawg dua los yog sib npaug rau 0.40%, ua kom zoo rau deoxidation thiab corrosion tsis kam;
• Tooj liab (CU): yeem ntau dua lossis muaj sib npaug rau 0.20% (tooj liab uas muaj hom), txhim kho kom tsis kam rau cov atmospheric corrosion.

Dab tsi yog cov khoom siv tshuab ntawm A178 Welded yeeb nkab?

• Muaj zog yuav tsum tau ua:

Tensile lub zog: 400-550 mpa;

Yield zog: ntau dua lossis sib npaug nrog 250 MPa (nominal tus nqi, tus nqi tiag tiag hloov kho raws qib);

• Ductility cov txheej txheem:

Elongation: ntau dua los yog sib npaug rau 20% (gauge ntev 200 hli);

Dabtsi yog khoov scessent: yuav tsum tau dhau flattening thiab khoov kev xeem (raws li GB / T 244-2020 txheem);

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• Kev Txwv Tshwj Xeeb: Cov Tubes nrog lub taub sab hauv<3.2 mm or wall thickness <0.4 mm have no mandatory mechanical property requirements.

Dab tsi yog cov khoom sib npaug rau A178 Welded yeeb nkab?