Peb cov ASTM A193 B7M stud kaw ob tho yog tsim los ntawm Cr-Mo hlau alloy thiab heat treated kom ua tau raws li cov kev xav tau hnyav ntawm NACE MR0175 / MR0103 rau kev pab cuam sour (H₂S). Txhua lub stud yog khub nrog A194 grade 2HM heavy hex nut, tsim tshwj xeeb rau kev tiv thaiv sulfide stress corrosion cracking (SSC) nyob rau hauv qhov chaw acidic.
Qhov kev sib txuas no yog tus qauv specification rau bolting hauv oil thiab gas refineries, chemical processing plants, thiab high-temperature pressure vessel applications uas standard B7 / 2H fasteners tsis raug tso cai vim qhov hardness limits.
Tus Qauv: ASTM A193/A193M, ASTM A194/A194M, ASME B18.2.2
Cov Khoom Siv: A193 Gr. B7M (stud) + A194 Gr. 2HM (nut)
Tus Hom: Stud kaw ob tho, stud xov tag, heavy hex nut
Xov: UNC, 8UN, Grade 2A (stud) / 2B (nut)
Qhov Loj Me: Imperial 1/4" – 4" | Metric M6 – M100
Qhov Kub: -29°C to 538°C (-20°F to 1000°F)
Kev Tiv Thaiv SSC: Yog - ua raws li NACE MR0175 / MR0103
C: 0.38–0.48 | Mn: 0.75–1.00 | P: ≤0.035 | S: ≤0.040
Si: 0.15–0.35 | Cr: 0.80–1.15 | Mo: 0.15–0.25
C: ≥0.15 | Mn: ≤1.00 | P: ≤0.04 | S: ≤0.05 | Si: ≤0.40
B7M Stud:
Qhov Tsawg Tshaj Plaws Tensile Strength: 100 KSI (689 MPa)
Qhov Tsawg Tshaj Plaws Yield Strength: 80 KSI (551 MPa)
Elongation: ≥18%
Hardness: HB 197–235 (max 235)
Kev Kho Kub: Quenched & tempered
2HM Nut:
Proof Load: 150 KSI (1034 MPa)
Hardness: HB 159–237
Kev Kho Kub: Quenched & tempered
B7M grade yog ib qho low-hardness variant ntawm B7, tsim tshwj xeeb rau cov chaw uas sulfide stress cracking (SSC) yog ib qho txaus ntshai:
Txhua qhov kev txiav txim suav nrog material traceability certified to ASTM specifications. Peb muab mill test reports (MTRs) nrog chemical composition, mechanical properties, thiab heat treatment records. Peb lub chaw muaj Brinell hardness testers, tensile testing machines, thiab impact testers rau kev tshuaj xyuas zoo hauv tsev.
Thov kom tus nqi lossis nug ib lo lus nug txog ASTM A193 B7M studs nrog A194 2HM nuts. Peb xa mus thoob ntiaj teb nrog tag nrho material traceability.
