Cov pa roj carbon steel OCTG cov kav dej yog cov khoom tsim khoom tsim los rau qhov chaw nyob hauv qhov chaw tsis zoo uas tsis tuaj yeem lees txais. Lawv cov txheej txheem kev tsim khoom thiab kev kho cua sov tsis yog cov txheej txheem kev lag luam nkaus xwb tab sis nruj tswj kev ua haujlwm ntawm metallurgical uas txiav txim siab zaum kawg lub zog, toughness, seem stability, thiab tsis kam mus rau ib puag ncig tawg. Los ntawm kev npaj billet mus rau qhov kawg threading, txhua theem cuam tshuam qhov kev ntseeg tau ntawm cov txheej txheem ntawm casing thiab tubing siv hauv cov roj thiab cov qhov dej.
Tsis zoo li cov pa roj carbon steel kav, OCTG cov khoom yuav tsum tau ua raws li cov kev cai nruj raws li cov qauv xws li API 5CT. Cov qauv no tswj xyuas cov tshuaj muaj pes tsawg leeg, tsim cov txheej txheem, txheej txheem kho cua sov, kev sim tshuab, thiab cov txheej txheem tshuaj xyuas. Kev nkag siab txog kev tsim khoom thiab kev kho cua sov li cas muab kev nkag siab txog vim li cas cov kav dej OCTG tuaj yeem tiv taus siab sab hauv, sab nrauv tawg, thiab cov kev pabcuam corrosive.
Steelmaking thiab Raw Material Preparation
Chemical Composition Control
Kev tsim cov pa roj carbon steel OCTG pib nrog steelmaking, feem ntau los ntawm cov pa oxygen yooj yim los yog hluav taws xob arc rauv txoj hauv kev. Cov hlau molten yog refined los tswj cov pa roj carbon, manganese, silicon, phosphorus, thiab sulfur cov ntsiab lus. Tsawg impurity theem yog qhov tseem ceeb vim hais tias kev sib koom ua ke thiab kev sib cais tuaj yeem txo cov kev cuam tshuam toughness thiab txhawb kev tawg pib nyob rau hauv cyclic loading.
Cov ntsiab lus carbon yog ua tib zoo kho kom ua tiav lub hom phiaj lub zog thaum khaws cia ductility. Cov pa roj carbon ntau yuav ua rau muaj kev nyuaj siab, tab sis tuaj yeem txo qis kev puas tsuaj. Alloying cov ntsiab lus xws li manganese txhim kho hardenability, tso cai rau cov khoom sib xws thoob plaws hauv cov yeeb nkab phab ntsa thaum kho cua sov.
Nruam Casting thiab Billet Zoo
Tom qab refining, steel yog nruam nruam mus rau hauv round billets. Uniform solidification yog ib qho tseem ceeb los txo cov voids sab hauv thiab kev sib cais hauv nruab nrab. Billet deg conditioning tshem tawm qhov tsis xws luag ua ntej pib ua haujlwm. High-kev npaj billet zoo txo qhov kev pheej hmoo ntawm kev poob qis thiab ua kom tus cwj pwm zoo sib xws thaum dov thiab kho cua sov.
Cov txheej txheem ua yeeb nkab
Seamless Manufacturing
Feem ntau siab -kev ua tau zoo carbon steel OCTG kav yog tsim los ntawm txoj kev seamless. Lub billet yog rhuab mus rau ib tug tswj kub thiab pierced los ua ib tug hollow plhaub. Tom qab dov nyob rau hauv mandrel mills los yog stretch -txo mills adjusts sab nraud txoj kab uas hla thiab phab ntsa thickness yuav tsum tau.
Cov txheej txheem seamless tshem tawm longitudinal weld seams, muab cov qauv zoo sib xws thiab txhim khu kev tiv thaiv kom tawg thiab tawg kev ntxhov siab. Dimensional tswj thaum lub sij hawm dov kom ntseeg tau concentricity, uas ncaj qha cuam tshuam rau lub zog ntawm lub cev thiab kev sib txuas.
Welded Manufacturing rau kev siv tshwj xeeb
Hauv qee qhov nruab nrab- daim ntawv thov kev pabcuam, cov kav dej hluav taws xob kuj siv tau. Hlau sawb yog tsim rau hauv ib lub cylindrical zoo thiab welded longitudinally. Lub weld cheeb tsam yog tom qab ntawd cov cua sov kho kom homogenize microstructure thiab rov kho cov cuab yeej cuab tam piv rau lub hauv paus hlau.
Cov lus hauv qab no sib piv seamless thiab welded manufacturing yam ntxwv.
| Txoj kev tsim khoom | Pib Khoom | Cov qauv sib xws | Daim ntawv thov OCTG | Tus nqi txheeb ze |
|---|---|---|---|---|
| Seamless | Khoom billet | Tsis muaj weld seam | Qhov tob thiab siab - qhov dej siab | Siab dua |
| ERW Welded | Hlau strip | Longitudinal weld seam | Nruab nrab- qhov tob | qis |
Txawm hais tias cov kav dej welded muab cov txiaj ntsig zoo rau kev lag luam, cov kav dej seamless yeej muaj siab - siab thiab kev siv qhov dej tseem ceeb vim muaj kev ua haujlwm zoo dua qub.
Cov txheej txheem kho cua sov
normalizing
qis dua - qib zog xws li J55 thiab K55 tuaj yeem ua rau muaj kev ua haujlwm zoo. Nyob rau hauv cov txheej txheem no, cov kav dej yog rhuab saum toj no lub transformation kub thiab txias nyob rau hauv cov huab cua. Normalizing refines grain qauv, txhim kho uniformity, thiab relieves kev ntxhov siab nyob rau hauv qhia thaum dov. Qhov tshwm sim ferrite-pearlite microstructure muab lub zog nruab nrab nrog cov ductility zoo.
Quenching thiab Tempering
Siab dua - qib zog xws li N80, L80, P110, thiab Q125 yuav tsum tau quenching thiab tempering. Thaum lub sij hawm quenching, cov yeeb nkab yog rhuab mus rau lub austenitizing kub thiab txias sai heev, feem ntau nyob rau hauv dej. Qhov txias txias no ua rau martensite, siab -lub zog tab sis brittle microstructure.
Tempering ua raws li quenching thiab koom nrog reheating rau qhov kub thiab txias kom txo brittleness thaum tuav lub zog siab. Cov txheej txheem tempering kho hardness thiab toughness kom ua tau raws li qhov xav tau sib npaug ntawm kev tawg tsis kam thiab tawg tsis kam.
Cov lus hauv qab no qhia txog cov txheej txheem kev kho cua sov thiab lawv cov teebmeem metallurgical.
| Kev kho cua sov | Hom Qib | Qhov tshwm sim Microstructure | Cov txiaj ntsig tseem ceeb | Tseem ceeb Risk yog tias tsis tsim nyog |
|---|---|---|---|---|
| normalizing | J55, K55 | Refined ferrite -pearlite | Uniformity thiab ductility | Lub zog tsis txaus |
| Quenching | N80, P110 | Martensite | Siab zog | Tshaj brittleness |
| Tempering | N80, L80, P110 | Tempered martensite | Lub zog- toughness balance | Tshaj - softening lossis dhau - hardening |
| Kev ntxhov siab | Welded kav | Txo cov kev ntxhov siab seem | Dimensional stability | Kev tshem tawm tsis tiav |
Kev tswj qhov kub thiab txias, lub sijhawm so, thiab qhov txias txias yog qhov tseem ceeb. Kev hloov pauv tuaj yeem ua rau muaj qhov tsis sib xws, ua rau muaj kev cuam tshuam rau sulfide kev nyuaj siab tawg hauv qhov chaw qaub.
Kev ua tiav tiav thiab kev xa xov
Tom qab kev kho cua sov, cov kav dej tau ncaj qha, qhov loj me, thiab kev ua tiav tiav. Dimensional raug yog qhov tseem ceeb vim tias kev sib tsoo tsis sib haum thiab kev sib koom ua ke nyob ntawm qhov tseeb geometry. Cov yeeb nkab kawg yog threaded raws li API lossis cov qauv kev sib txuas hwm zoo.
Xov txiav yuav tsum tau ua tib zoo machining los khaws cov kev ncaj ncees ntawm cov yeeb nkab kawg. Cov kev kho saum npoo yuav raug siv los tiv thaiv galling thaum lub sij hawm ua -up. Couplings yog tsim los ntawm cov qib carbon steel sib xws kom tswj tau cov khoom siv sib xws.
Kev tshuaj xyuas thiab Kev Ntsuas Zoo
Kev tshuaj ntsuam xyuas kom ua tau raws li cov kev xav tau ntawm txhua yam thiab qhov ntev. Tsis yog-kev kuaj kev puas tsuaj xws li kev kuaj ultrasonic kuaj xyuas qhov tsis xws luag. Magnetic particle soj ntsuam xyuas cov kab nrib pleb. Kev ntsuam xyuas hydrostatic txheeb xyuas qhov muaj peev xwm muaj peev xwm.
Kev ntsuas tshuab, suav nrog kev ntsuas tensile thiab kev cuam tshuam, lees paub cov khoom muaj zog, lub zog tensile, elongation, thiab toughness. Kev ntsuam xyuas hardness yog qhov tseem ceeb tshwj xeeb rau cov qib kev pabcuam qaub uas qhov nyuaj heev tuaj yeem txhawb kev tawg.
Traceability systems sau cov tshuaj muaj pes tsawg leeg, cov ntaub ntawv kho cua sov, thiab cov txiaj ntsig tshuaj xyuas rau txhua cov yeeb nkab. Cov ntaub ntawv no txhawb nqa kev tswj hwm kev pheej hmoo hauv siab - cov dej num drilling.
Kev koom ua ke ntawm Kev Tsim Khoom thiab Kev Ua Haujlwm
Kev sib cuam tshuam ntawm kev tsim khoom thiab kev kho cua sov txiav txim siab qhov ua tiav OCTG kawg. Tswj steel chemistry kom paub tseeb tias kev hloov pauv thaum lub sijhawm quenching thiab tempering. Uniform cua sov thiab cua txias tswj cov khoom sib xws raws li cov yeeb nkab lub cev. Dimensional precision txhim khu kev sib tsoo tsis kam thiab kev sib txuas ncaj ncees.
Kev nce qib hauv cov tshuab hluav taws xob siv hluav taws xob thiab cov tshuab soj ntsuam digital tau txhim kho qhov sib xws thiab txo qhov sib txawv. Niaj hnub nimno OCTG manufacturing integrates tiag tiag - tswj lub sij hawm kub, tsis yog - kev soj ntsuam kev puas tsuaj, thiab cov ntaub ntawv mus txog qhovtwg kom ntseeg tau tias zoo dua.
Xaus
Kev tsim khoom thiab kev kho cua sov ntawm cov pa roj carbon steel OCTG kav sawv cev rau kev sib koom ua ke ntawm cov hlau thiab cov txheej txheem tsim los tsim cov khoom siab - lub zog, txhim khu kev qha tubular khoom rau cov roj thiab cov qhov dej. Seamless forming ua kom cov qauv sib xws, thaum tswj kev kho cua sov tsim kom muaj qhov sib npaug ntawm lub zog thiab tawv. Kev tshuaj xyuas nruj thiab kev tswj qhov ntev ntxiv tau lees tias ua raws li cov qauv kev xav tau. Los ntawm kev sib koom ua ke ntawm steelmaking, tsim, thiab thermal ua, carbon steel OCTG kav ua tiav cov kav ntev thiab kev nyab xeeb tsim nyog rau kev ua haujlwm hauv qhov chaw qis qis.
