张银桥, 黎福华, 孔繁革, et al. Production Practice of 09MnNiD Steel Φ 219 mm x 20 mm Seamless Tube for -70 °C Low Temperature and Cryogenic Service[J]. Special Steel, 2022, 43(4): 66-69.
张银桥, 黎福华, 孔繁革, et al. Production Practice of 09MnNiD Steel Φ 219 mm x 20 mm Seamless Tube for -70 °C Low Temperature and Cryogenic Service[J]. Special Steel, 2022, 43(4): 66-69.DOI:
按照20 t EAF→LF+VD→模铸3t钢锭→轧制Φ270 mm圆钢→斜轧穿孔→CPE轧管→在线常化工艺流程
生产Φ219 mm×20 mm 09MnNiD钢无缝管(/%:0.07~0.10C
0.25~0.35Si
1.35~1.40Mn
0.49~0.51Ni
0.020~0.035Al
≤0.02Nb
≤0.015P
≤0.006S)。通过控制EAF终点C≤0.04%和P≤0.008%
LF精炼S≤0.005%
VD≤67Pa
≥15 min
模铸过热度≤45℃
热轧后荒管冷却速度30~70℃/min
钢管常化温度910℃
开发了Φ219 mm×20 mm钢管。测试结果表明:生产的钢管显微组织为F+P
晶粒度10级
-70℃冲击功KV2≥275 J
抗拉强度503~508 MPa
屈服强度354~356 MPa
以及其化学成分、非金属夹杂物、无损检测均满足GB 150.2-2011标准要求。
Abstract
The Φ219 mm x 20 mm seamless tube of 09MnNiD steel (/% ;0.07 ~ 0.10G
0. 25 ~ 0.35Si
1.35〜1.40Mn
0.49 〜0.51Ni
0.020 ~O.O35A1
≤0. 02Nb
≤0.015P
≤0.006S) has been produced by 20 t EAF—LF + VD→ ingot casting —► rolling Φ270 mm round billet—► cross piercing → CPE rolling tube—► online normalization. By controlling EAF endpoint [C] ≤ 0.04% and [ P] W≤ 0. 008%
LF refining [S] ≤ 0.005%
VD≤67Pa
15 min
ingot cast steel overheating ≤ 45 °C
cooling rate of hot rolled piercing shell 30 ~70 P/min
and steel tube normalizing at 910 °C. The test results show that the microstructure is F + P
grain size grade 10
—70 °C impact energy KV2 3257 J
tensile strength 503 〜508 MPa
yield strength 354~356 MPa
and the chemical composition
mechanical properties
nondestructive testing meet the requirements of GB 150.2-2011 standard.