ASTM A519 PIB

Tianjin Lefin Industrial Co., Ltd yog ib qho ntawm cov tuam ntxhab thiab cov muag khoom ntawm astm a519 yeeb nkab hauv Suav teb. Thov koj xav tias dawb mus yuav zoo astm a519 yeeb nkab los ntawm peb lub hoobkas. Kev pabcuam zoo thiab tus nqi tsim nyog muaj.

Cov kev cai rau seamless mechanical pipes (PIPE) hauv ASTM A519 tus qauv npog ntau qhov ntev xws li cov khoom siv, cov khoom siv kho tshuab, qhov ntev ntev, thiab kev siv tshuab. Lub hauv paus tseem ceeb yog los xyuas kom meej tias lawv ua tau raws li lub zog ntawm cov qauv, kev hloov kho, thiab qhov yuav tsum tau muaj kev ruaj ntseg hauv kev tsim khoom. Cov hauv qab no yog cov ntsiab lus ntawm cov kev cai tseem ceeb:

1. Khoom siv ntau yam

Npog cov pa roj carbon steel thiab hlau alloy, cov qib muaj xws li:

• Carbon steel:1010, 1020, 1026, 1045, thiab lwm yam. (tsawg carbon mus rau nruab nrab carbon steel, hais txog machinability thiab toughness);

• Alloy steel: 4130, 4140, 4340, thiab lwm yam (muaj cov ntsiab lus alloying xws li chromium thiab molybdenum, hais txog lub zog siab thiab hnav tsis kam).

2. Tshuaj muaj pes tsawg leeg txwv

Rau cov ntsiab lus xws li carbon (C), manganese (Mn), silicon (Si), phosphorus (P), thiab sulfur (S), muaj cov txwv sab saud (piv txwv li, sulfur cov ntsiab lus tsawg dua lossis sib npaug li 0.050%, phosphorus cov ntsiab lus tsawg dua lossis sib npaug li 0.040%). Alloy steel kuj yuav tsum tau tswj cov ntsiab lus ntawm alloying ntsiab xws li chromium thiab molybdenum los xyuas kom meej stability ntawm txhua yam khoom.

Qhov no yog qhov tseem ceeb ntawm ASTM A519, uas yog ncaj qha ntsig txog kev thauj khoom -cov kabmob muaj peev xwm ntawm cov khoom siv yeeb nkab:

1. Tensile zog: Nyob ntawm cov khoom siv, qhov ntau yog feem ntau 330-795 MPa (piv txwv li, 1020 steel Ntau dua lossis sib npaug rau 379 MPa, 4140 steel Ntau dua lossis sib npaug rau 655 MPa);
2. Lub zog tawm los: Ntau dua lossis sib npaug ntawm 207 MPa (tsawg- carbon steel) rau Ntau dua lossis sib npaug rau 414 MPa (cov hlau alloy);
3. Elongation: Ntau dua lossis sib npaug li 5% rau cov kav dej txias- ua haujlwm thiab Ntau dua lossis sib npaug li 10% rau cov kav dej kub - ua haujlwm (kom ntseeg tau qee qhov tawv thiab tsis txhob tawg tawg);
4. Hardness: Qee qib yuav tsum ua tau raws li Brinell hardness (HB) cov cai (piv txwv li, HB ntawm 4140 steel tom qab kev kho cua sov yuav tsum tsawg dua lossis sib npaug li 235).

Nco tseg: Nws yuav tsum tau kuaj xyuas los ntawm kev sim tensile thiab hardness tests, thiab cov qauv kuaj yuav tsum tau muab los ntawm cov yeeb nkab lub cev.

III. Dimensions thiab Tolerance Requirements
Yuav kom hloov mus rau precision mechanical processing, nruj me ntsis raws li qhov raug:
 

1. Sab nraud txoj kab uas hla (OD):

- Txias- cov kav dej ua haujlwm: Kev kam rau siab ± 0.005 nti (me me txoj kab uas hla) txog ± 0.010 ntiv tes (txoj kab uas hla loj);
- Kub- cov raj ua haujlwm: me ntsis dav dua (± 0.031 ntiv tes thaum lub taub sab nraud Tsawg dua lossis sib npaug li 2 ntiv tes).

2. Phab ntsa thickness (WT):

- Txias- cov yeeb nkab ua haujlwm: kam rau ua ± 10% (± 5% rau qee qhov tshwj xeeb);
- Cov raj kub ua haujlwm: Kev kam rau siab ± 12.5%.

3. Ncaj nraim:

Qhov dabtsi yog khoov℃ib ko taw ntev yog tsawg dua los yog sib npaug rau 0.015 ntiv tes, kom ntseeg tau tias nws tsis tuaj yeem deformation thaum ua.

4. Ntev:

Feem ntau 6 mus rau 24 ko taw, kho tau raws li qhov xav tau, tab sis yuav tsum ua kom tau raws li qhov yuav tsum tau ua.

1. Cov txheej txheem ntau lawm:

- Yuav tsum yog seamless tsim (kub dov, kos duab txias los yog txias dov), welding yog txwv tsis pub (qhov txawv ntawm welded kav);
Txias- cov hlab ua haujlwm yuav tsum tau txais kev kho mob annealing kom tshem tawm cov kev ntxhov siab thiab ua kom muaj qhov ruaj khov.

2. Nto zoo:

Sab hauv thiab sab nrauv yuav tsum du, tsis muaj kab nrib pleb, folds, nti thiab lwm yam tsis xws luag (uas cuam tshuam rau kev ua haujlwm thiab lub zog).
Kev khawb me me raug tso cai, tab sis qhov tob yuav tsum tsis pub tshaj 10% ntawm phab ntsa thickness kam rau ua.

1. Cov khoom kuaj xyuas

- Txheeb xyuas qhov loj thiab zoo li ntawm txhua daim ib los ntawm ib qho;
Kev tshuaj xyuas cov tshuaj muaj pes tsawg leeg thiab kev ntsuas cov cuab yeej cuab tam (tensile thiab hardness) tau ua los ntawm cov qauv batch.

Rau siab - cov ntawv thov siab lossis cov khoom siv tseem ceeb, yuav tsum tau kuaj ntxiv tsis yog -kev puas tsuaj (xws li kuaj pom qhov tsis haum ultrasonic).

2. Cov Lus Cog Tseg:

Txhua cov khoom siv yeeb nkab yuav tsum tau cim nrog tus lej tus qauv (ASTM A519), qib khoom siv, kev qhia tshwj xeeb, cov chaw tsim khoom, kev txheeb xyuas qhov tsim nyog, thiab lwm yam, kom yooj yim traceability.