Raws li GB / T9711.1 pipeline steel yeeb nkab kev ua tau zoo, raws li qhov sib txawv tempering kub, tuaj yeem muab faib ua hom tempering hauv qab no:
[1] Tsawg kub tempering (150-250 degrees)
Lub microstructure tau los ntawm qhov kub thiab txias yog tempered martensite.Nws lub hom phiaj yog los txo cov quenching kev nyuaj siab thiab brittleness ntawm hardened hlau nyob rau hauv lub premise ntawm kev tswj nws cov hardness siab thiab siab hnav tsis kam, thiaj li tsis txhob tawg los yog ntxov ntxov puas thaum siv.Nws yog tsuas yog siv rau txhua yam ntawm cov pa roj carbon ntau cov cuab yeej, ntsuas cov cuab yeej, GB / T9711.1 pipeline steel yeeb nkab, dov bearings thiab carburizing qhov chaw, thiab lwm yam., lub hardness tom qab tempering yog dav dav HRC58-64.
[2] Kev ntsuas kub nruab nrab (250-500 degrees)
Lub microstructure tau los ntawm nruab nrab tempering yog tempered trostite.Lub hom phiaj yog kom tau txais lub zog tawm los siab, elastic txwv thiab siab toughness.Yog li ntawd, nws yog tsuas yog siv rau txhua yam ntawm GB / T9711.1 pipeline steel yeeb nkab thiab kub pwm kev kho mob, tom qab tempering hardness feem ntau yog HRC35-50.
[3] Kub kub tempering (500-650 degrees)
Lub microstructure tau los ntawm kev kub siab tempering yog tempered sortensite.Feem ntau, kev kho cua sov ua ke nrog quenching thiab tempering yog hu ua quenching thiab tempering.Nws lub hom phiaj yog kom tau txais cov khoom siv zoo dua qub ntawm lub zog, hardness, plasticity thiab toughness.Yog li ntawd, nws yog dav siv nyob rau hauv tsheb, GB / T9711.1 pipeline steel yeeb nkab, tshuab cuab yeej thiab lwm yam tseem ceeb yam ntxwv qhov chaw, xws li txuas pas nrig, ntsia liaj qhov rooj, iav thiab ncej.Lub hardness tom qab tempering feem ntau yog HB200-330.
Txuj
API SPEC 5L - American Petroleum Institute Standard
GB / T9711 - Lub teb chaws tus qauv ntawm Tuam Tshoj
Siv
Siv rau oxygen, dej thiab roj conveying yeeb nkab nyob rau hauv roj av thiab natural gas kev lag luam
Lub ntsiab ntau lawm ntawm steel yeeb nkab qib:
B, X42, X52, X60, X65, X70 L245 L290 L320 L360 L390 L450 L485
Mechanical zog
| Txuj | Qib khoom | Qib Steel | Yield zog (min), Mpa | Tensile zog (MPa) |
| API 5L GB/T9711.2 | PSL 1 | A lub L210 | 210 | 335 |
| B los yog L245 | 245 | 415 | ||
| x42l290 ua | 290 | 415 | ||
| X46 los yog L320 | 320 | 4 35 | ||
| X52 los yog L360 | 360 | 460 | ||
| X56 los yog L390 | 390 | 490 ib | ||
| X60 los yog L415 | 415 | 520 | ||
| X 70 | 483 ib | 565 ib | ||
| PSL 2 | BR los yog L245R | 245-450 : kuv | 415-760 : kuv | |
| X42R or L290R | 290-495 : kuv | 415-760 : kuv | ||
| BN or L245 N | 245-450 : kuv | 415-760 : kuv | ||
| X42N or L290N | 290-495 : kuv | 415-760 : kuv | ||
| X46N or L320N | 320-525 : kuv | 435-760 : kuv | ||
| X52N or L360N | 360-530 : kuv | 460-760 Ib | ||
| X56N or L390N | 390-545 : kuv | 490-760 : kuv | ||
| X60N or L415N | 415-565 : kuv | 520-760 : kuv | ||
| X65N or L450N | 425-566 : kuv | 525-760 : kuv | ||
| X70 los yog L480 | 484-565 : kuv | 565-768 : kuv | ||
| X80 | 552-690 : kuv | 621-827 : kuv |
Table of chemical Elements in pipeline
| Qib khoom | Qib Steel | Tshuaj muaj pes tsawg leeg,% | ||||||||
| C | Mn | P | S | Thiab | IN | Nb | Of | CEEB | ||
| PSL 1 | B los yog L245 | ≤ 0.28 | ≤ 1.20 | ≤ 0.030 | ≤ 0.030 | - | - | - | - | - |
| x42l290 ua | ≤ 0.28 | ≤ 1.30 | ≤ 0.030 | ≤ 0.030 | - | - | - | - | - | |
| X46 los yog L320 | ≤ 0.28 | ≤ 1.40 | ≤ 0.030 | ≤ 0.030 | - | - | - | - | - | |
| X52 los yog L360 | ≤ 0.28 | ≤ 1.40 | ≤ 0.030 | ≤ 0.030 | - | - | - | - | - | |
| X56 los yog L390 | ≤ 0.28 | ≤ 1.40 | ≤ 0.030 | ≤ 0.030 | - | - | - | - | - | |
| X60 los yog L415 | ≤ 0.28 | ≤ 1.40 | ≤ 0.030 | ≤ 0.030 | - | - | - | - | - | |
| X 70 | ≤ 0.28 | ≤ 1.40 | ≤ 0.030 | ≤ 0.030 | - | - | - | - | - | |
| PSL 2 | BR los yog L245R | ≤ 0.24 | ≤ 1.20 | ≤ 0.025 | ≤ 0.015 | ≤ 0.40 | c | c | ≤ 0.04 | ≤ 0.25 |
| X42R or L290R | ≤ 0.24 | ≤ 1.20 | ≤ 0.025 | ≤ 0.015 | ≤ 0.40 | ≤ 0.06 | ≤ 0.05 | ≤ 0.04 | ≤ 0.25 | |
| BN or L245 N | ≤ 0.24 | ≤ 1.20 | ≤ 0.025 | ≤ 0.015 | ≤ 0.40 | c | c | ≤ 0.04 | ≤ 0.25 | |
| X42N or L290N | ≤ 0.24 | ≤ 1.30 | ≤ 0.025 | ≤ 0.015 | ≤ 0.40 | ≤ 0.06 | ≤ 0.05 | ≤ 0.04 | ≤ 0.25 | |
| X46N or L320N | ≤ 0.24 | ≤ 1.40 | ≤ 0.025 | ≤ 0.015 | ≤ 0.40 | ≤ 0.07 | ≤ 0.05 | ≤ 0.04 | ≤ 0.25 | |
| X52N or L360N | ≤ 0.24 | ≤ 1.40 | ≤ 0.025 | ≤ 0.015 | ≤ 0.45 | ≤ 0.10 | ≤ 0.05 | ≤ 0.04 | ≤ 0.25 | |
| X56N or L390N | ≤ 0.24 | ≤ 1.40 | ≤ 0.025 | ≤ 0.015 | ≤ 0.45 | ≤ 0.10 | ≤ 0.05 | ≤ 0.04 | ≤ 0.25 | |
| X60N or L415N | ≤ 0.24 | ≤ 1.40 | ≤ 0.025 | ≤ 0.015 | ≤ 0.45 | ≤ 0.10 | ≤ 0.05 | ≤ 0.04 | - | |
| X65N or L450N | ≤ 0.24 | ≤ 1.40 | ≤ 0.025 | ≤ 0.015 | ≤ 0.45 | ≤ 0.10 | ≤ 0.05 | ≤ 0.04 | - | |
| X70 N | ≤ 0.24 | ≤ 1.40 | ≤ 0.025 | ≤ 0.015 | ≤ 0.45 | ≤ 0.10 | ≤ 0.05 | ≤ 0.04 | - | |
| X80 | ≤ 0.24 | ≤ 1.40 | ≤ 0.025 | ≤ 0.015 | ≤ 0.45 | ≤ 0.10 | ≤ 0.05 | ≤ 0.04 | ||
Post lub sij hawm: May-23-2022