ASTM A519 (SA519) 4140 Seamless Carbon & Alloy Steel Tshuab Tubing
ASTM A519 yog tus qauv tshwj xeeb rauseamless carbon thiab alloy steel mechanical tubing. Nws npoghollow cylindersnpaj rau machining rau hauvmechanical Cheebtsam, tsis yog rau siab piping lossis kua conveyance.
Qhov Tseem Ceeb Distinction: Mechanical Tubing vs. Pressure Pipe
| Feature | ASTM A519 Txhuas Tubing | ASTM A335 Siab yeeb nkab |
|---|---|---|
| Lub Hom Phiaj | Machined Structure Parts: hydraulic kheej kheej, ncej, iav, rollers, txuas. | Kev xa tawm kua: siab-kub/siab txheej txheem kab, cov kav dej. |
| Tsim Tsim | Mechanical Properties(lub zog, hardness, hnav tsis kam). | Siab -Tsuas Ntsuas& siab kub ua haujlwm. |
| Khoom siv tseem ceeb | Carbon & alloy steels (piv txwv li, 1020, 1045,4140, 4130). | Alloy steels rau siab -temp kev pab (piv txwv li, P11, P22, P91). |
| Kev xav tau tseem ceeb | Dimensional raug, nto tiav, cov khoom sib xws tom qab kev kho cua sov. | Weldability, creep zog, cuam tshuam toughness. |
Paub meej Specification rau Qib 4140
Khoom siv: AISI/SAE 4140- Ib qho nruab nrab -carbon, chromium- molybdenum alloy hlau muaj npe nrov rau nwssiab zog, zoo toughness, thiab zoo heev hardenability.
Chemical Composition (Qib 4140):
| Element | Kev sib xyaw (%) |
|---|---|
| Cov pa roj carbon (C) | 0.38 – 0.43 |
| Manganese (Mn) | 0.75 – 1.00 |
| Phosphorus (P), max | 0.035 |
| Sulfur (S), max | 0.040 |
| Silicon (Si) | 0.15 – 0.35 |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (hli) | 0.15 – 0.25 |
Cov Khoom Siv Hluav Taws Xob (Tom qab Quenching & Tempering):
Cov khoom sib txawv nrog kev kho cua sov (tempering kub).
| Khoom | Hom kab mob |
|---|---|
| Tensile zog | 860 - 1000+ MPa (125,000 - 145,000+ psi) |
| Yield zog | 760 - 900+ MPa (110,000 - 130, 000+ psi) |
| Elongation (hauv 50mm) | 15% – 22% |
| Hardness | 280-350 HWB |
Common Supply Conditions:
Annealed los yog Normalized:Rau kev ua kom yooj yim dua.
Quenched & Tempered (Q&T):Yuav kom ua tiav cov qib siab zog thiab hardness.
Cov ntawv thov tseem ceeb
Hydraulic & Pneumatic Systems:Lub tog raj kheej kheej kheej, piston pas nrig.
Automotive thiab Aerospace:Tsav shafts, axles, tsaws iav Cheebtsam.
General Machinery:Gear blanks, spindles, rollers, couplings.
Tooling & Pwm:Yas pwm cores, jigs, fixtures.
Roj & Roj:Downhole cuab yeej Cheebtsam (tsis yog -siab muaj).
⚠️ Kev Ceeb Toom Tseem Ceeb: Tsis yog rau Kev Pabcuam Siab
ASTM A519 4140 tubing tsis tau ntawv pov thawj los yog npaj rau kev pabcuam cov kua dej.
NwsTSIS ntsibQhov yuav tsum tau ua ntawm cov kav dej siab (piv txwv li, ASME B31.1/B31.3) rau cov khoom siv traceability, NDE, thiab kev ntsuam xyuas cuam tshuam.
NwsWeldability tsis zoo(vim qhov sib npaug ntawm cov pa roj carbon ntau) ua rau nws raug mob heevtxias tawgyog tias welded tsis raug. Siv nws raws li cov yeeb nkab siab tsim muaj kev pheej hmoo loj ntawmkev puas tsuaj loj.
Yog tias koj xav tau cov yeeb nkab siab, xav txog:
Rau siab - lub zog txhawb nqa (tsis yog- siab):ASTM A53 Gr. Blos yogAPI 5L Gr. B.
Rau siab -kub alloy steel siab piping:ASTM A335 Cov Lus Qhia Tshwj XeebQib (P11, P22, P91).
Rau siab -lub zog, weldable pipeline kev pab:API 5LQib (X42 txog X80).
Hauv cov ntsiab lus: ASTM A519 4140 yog qhov siab - lub zogmechanical tubingrau kev tsim khoom ruaj khov, tsis yog alub cev muaj zograu kev xa dej.Cov ntawv thov thiab cov qauv kev nyab xeeb yog qhov sib txawv.
