Scope ntawm Specification
ASTM A519 npog seamless mechanical tubing ua los ntawm carbon steel thiab alloy steel rau txhua yam, machining thiab siab daim ntawv thov. Nws yog ib tug tubing specification es tsis yog ib tug yeeb nkab specification: cov khoom yog ib txwm siv rau machined qhov chaw, hydraulic thooj voos kheej kheej, chais, shafts, bushings thiab downhole cuab tam Cheebtsam, qhov twg lub sab nraud txoj kab uas hla, sab hauv txoj kab uas hla thiab phab ntsa thickness yuav tsum tuav nruj thiab cov khoom yuav tsum tshuab kwv yees.
Tubing yog muab nyob rau hauv ob qho kev mob. Cov tubing kub ua tiav yog tsim los ntawm kev tho thiab ua haujlwm kub, thiab muab tso rau hauv raws li - dov, normalized lossis lwm yam kev pom zoo. Cold drawn tubing yog tsim los ntawm kev kos duab hla lub mandrel los yog ntsaws tom qab pickling, uas muab cov kev tswj kom nruj thiab txhim kho qhov chaw tiav uas cov lus qhia paub txog.
Qib thiab Qhov Chaw Chemistry Los Ntawm
A519 tsis tsim nws tus kheej chemistry. Cov tubing yog tsim los ntawm cov qib uas nws cov tshuaj yuav tsum tau teev tseg nyob rau hauv cov pa roj carbon steel thiab alloy steel qib specifications uas qhov kev txiav txim cites, thiab cov A519 rooj ces siv rau lub tiav tube. Cov qib carbon feem ntau suav nrog 1010, 1015, 1020, 1026 thiab 1045; Cov qib alloy feem ntau suav nrog 4130, 4140, 4150, 4340 thiab 8620. Cov khoom sib xyaw ntawm ob qib feem ntau xaj alloy:
| Element, feem pua | 4130 | 4140 |
|---|---|---|
| Cov pa roj carbon | 0.28-0.33 Nws | 0.38-0.43 Nws |
| Manganese | 0.40-0.60 Nws | 0.75-1.00 Nws |
| Silicon | 0.15-0.35 Nws | 0.15-0.35 Nws |
| Chromium | 0.80-1.10 Nws | 0.80-1.10 Nws |
| Molybdenum | 0.15-0.25 Nws | 0.15-0.25 Nws |
Cov pa roj carbon ntau dua thiab manganese ntawm 4140 yog qhov tso cai rau nws kom ncav cuag lub zog ntau dua li 4130 tom qab quenching thiab tempering, ntawm qee tus nqi hauv weldability thiab hauv machining tus cwj pwm nyob rau hauv raws li - khoom.
Yuav ua li cas cov cuab yeej cuab tam raug qhia
Cov cuab yeej cuab tam yuav tsum tau khi rau qib thiab rau qhov xwm txheej uas cov tubing tau muab. Kub tiav tubing nyob rau hauv cov qib carbon feem ntau raug txiav txim siab tsawg kawg nkaus tensile lub zog thiab qhov tsawg kawg nkaus elongation, thaum txias drawn tubing muaj zog dua vim qhov txias ua hauj lwm nws tau txais. Cov qib alloy xws li 4130 thiab 4140 feem ntau raug txiav txim rau hauv qhov kub thiab txias thaum xav tau lub zog siab, thiab tus neeg yuav khoom hais txog qib zog yuav tsum tau - yield zog, tensile lub zog thiab qhov tsawg kawg nkaus elongation - ntawm qhov kev txiav txim, vim tias tib qib tuaj yeem muab tau ntawm ob peb lub zog.
Qhov ntawd yog qhov ua tau zoo rau tus neeg yuav khoom: rau A519 tubing, daim ntawv pov thawj zeb qhia cov txiaj ntsig ntawm cov cua sov thiab ntau yam tawm tsam qhov kev pom zoo, thiab cov lus qhia tshwj xeeb rau kev kuaj xyuas yog ib qho sau rau ntawm daim ntawv xaj thiab lees paub ntawm daim ntawv lees paub, tsis yog ib lub rooj sib tham. Cov kev txwv hardness, qhov twg tau teev tseg, feem ntau teev raws li qhov siab tshaj plaws lossis ntau yam hauv qhov tsim nyog rau qhov loj me.
Dimensional Control, Tolerances thiab Kev Ntsuas
Sab nraud txoj kab uas hla, sab hauv txoj kab uas hla thiab phab ntsa thickness tolerances nyob ntawm seb txoj kev tsim khoom thiab seb lub raj puas tom qab kho cua sov, thiab lawv tau nyeem los ntawm cov lus kam rau ua nyob rau hauv specification rau qhov luaj li cas thiab kev mob txiav txim. Cold drawn tubing nyob rau hauv kev lag luam ntau qhov ntau thiab tsawg yog ib txwm muab rau kev ua siab ntev dua qhov kub tiav tubing, thiab qhov twg cov nyiaj siv ua haujlwm yuav tsum tau kwv yees, txiav txim siab rau qhov siab tshaj plaws thiab qhov tsawg kawg nkaus phab ntsa yog qhov tseem ceeb tshaj qhov kev txiav txim rau phab ntsa nominal ib leeg.
Cov kev xav tau ntxiv hauv cov kev qhia tshwj xeeb tso cai rau tus neeg yuav khoom ntxiv tsis yog - kev kuaj xyuas kev puas tsuaj xws li eddy tam sim no lossis kev kuaj ultrasonic, kev tshuaj xyuas cov khoom, kev kuaj xyuas hardenability, lossis ib qho kev xav tau ntawm qhov chaw tshwj xeeb. Kev ncaj, ovality, nto tiav thiab qhov kawg kawg kuj tau hais, txij li lub raj uas yog qhov tseeb tab sis hneev yuav tsis khiav los ntawm lub bar feeder lossis lub chaw machining.
Machining, Kev kho cua sov thiab kev siv
Cov qib carbon xws li 1020 thiab 1026 tshuab dawb thiab siv rau cov khoom siv dav dav thiab cov khoom siv hydraulic qis. Alloy qib yog siv qhov muaj zog, qaug zog los yog hnav tsis kam: 4130 muaj qhov zoo sib npaug ntawm lub zog thiab tawv rau cov khoom siv vuam lossis tshuab, 4140 yog cov qauv kev xaiv rau lub zog siab, lub tog raj kheej thiab cov cuab yeej lub cev, thiab 4340 yog xaiv qhov twg ntu loj thiab qhov xav tau ntau dua. Vim hais tias cov qib alloy harden nyob rau hauv lub cuab tam yog txiav tsis zoo, machining feem ntau yog nqa tawm nyob rau hauv lub annealed los yog normalized mob thiab ib feem yog kub kho tom qab. Qhov twg ib feem yog quenched thiab tempered tom qab machining, qhov seem hloov yuav tsum tau tso cai rau, thiab qhov kawg qhov ntev tau soj ntsuam tom qab kev kho cua sov.
Cov lus nug nquag
Q:Puas yog ASTM A519 cov yeeb nkab tshwj xeeb lossis cov yeeb nkab tshwj xeeb?
A: Nws yog ib tug neeg kho tshuab tubing specification. Nws npog seamless carbon thiab alloy steel tubing rau kev siv tshuab thiab machining, nrog kev tswj kom nruj dua li cov yeeb nkab kab thiab cov khoom siv sib txawv.
Q:Qhov twg A519 tau txais nws cov tshuaj muaj pes tsawg leeg?
A: Los ntawm cov pa roj carbon thiab alloy steel qib specifications tau hais los ntawm kev txiav txim rau cov qib siv, xws li 1020 rau carbon thiab 4130 lossis 4140 rau alloy tubing. A519 tswj cov raj tiav qhov ntev, qhov xwm txheej thiab cov khoom siv kho tshuab.
Q:Vim li cas tib qib A519 qhia qhov muaj zog sib txawv ntawm cov ntawv pov thawj sib txawv?
A: Vim hais tias cov tubing tuaj yeem muab tau rau hauv cov xwm txheej sib txawv - kub tiav, txias txias, annealed, normalized los yog quenched thiab tempered - thiab lub zog yuav tsum tau pom zoo ntawm kev txiav txim theem. Daim ntawv pov thawj qhia txog qhov kev txiav txim, tsis yog ib tus nqi ruaj khov.
Q:A 519 4140 tubing puas tuaj yeem welded?
A: Nws tuaj yeem welded nrog cov txheej txheem tsim nyog, preheat thiab tom qab-weld kev kho cua sov, tab sis cov ntsiab lus siab carbon thiab alloy ua rau vuam xav tau ntau dua li qib qis carbon. Qhov twg vuam yog cov txheej txheem tseem ceeb, qib qis carbon feem ntau nyiam dua.
Q:Dab tsi ntxiv tuaj yeem txiav txim nrog A519 tubing?
A: Cov kev cai ntxiv tso cai rau tsis yog - kev kuaj xyuas kev puas tsuaj los ntawm eddy tam sim no lossis ultrasonic txoj kev, kev tshuaj xyuas cov khoom, kev sim hardenability thiab cov kev xav tau tshwj xeeb saum npoo, ntxiv rau cov qauv ntsuas nruj tshaj tawm ntawm daim ntawv pov thawj.