Acta Metallurgica Sinica (English Letters) ›› 2014, Vol. 27 ›› Issue (3): 464-468.DOI: 10.1007/s40195-014-0063-1
• research-article • Previous Articles Next Articles
Leyu Zhou, Bo Jiang, Mingyang Li, Fuchun Yuan, Chaolei Zhang, Yazheng Liu()
Received:
2014-03-27
Revised:
2013-04-22
Online:
2014-06-25
Published:
2014-07-18
Leyu Zhou, Bo Jiang, Mingyang Li, Fuchun Yuan, Chaolei Zhang, Yazheng Liu. Microstructure Control of Non-quenched and Tempered CT80 Grade Coiled Tubing Steel[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(3): 464-468.
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Steel | C | Si | Mn | Cr | P | S | Cu | Ni | Mo | Nb | Ti | V | Al | Fe |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
No. 1 | 0.07–0.12 | ≤0.45 | 0.70–1.10 | 0.45–0.65 | ≤0.015 | ≤0.002 | ≤0.30 | ≤0.25 | 0.24 | 0.049 | 0.010–0.020 | 0.015–0.040 | 0.07–0.12 | Bal |
No. 2 | 0.07–0.12 | ≤0.45 | 0.70–1.10 | 0.45–0.65 | ≤0.015 | ≤0.002 | ≤0.30 | ≤0.25 | 0.15 | 0.017 | 0.010–0.020 | 0.015–0.040 | 0.07–0.12 | Bal |
Table 1 Chemical compositions of tested steels (wt%)
Steel | C | Si | Mn | Cr | P | S | Cu | Ni | Mo | Nb | Ti | V | Al | Fe |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
No. 1 | 0.07–0.12 | ≤0.45 | 0.70–1.10 | 0.45–0.65 | ≤0.015 | ≤0.002 | ≤0.30 | ≤0.25 | 0.24 | 0.049 | 0.010–0.020 | 0.015–0.040 | 0.07–0.12 | Bal |
No. 2 | 0.07–0.12 | ≤0.45 | 0.70–1.10 | 0.45–0.65 | ≤0.015 | ≤0.002 | ≤0.30 | ≤0.25 | 0.15 | 0.017 | 0.010–0.020 | 0.015–0.040 | 0.07–0.12 | Bal |
Steel | Heating temperature (°C) | Finish rolling temperature (°C) | Cooling rate (°C/s) | Coiling temperature (°C) |
---|---|---|---|---|
No. 1–1 | 1,200 | 818 | 46 | 450 |
No. 1–2 | 1,200 | 830 | 50 | 450 |
No. 2–1 | 1,200 | 810 | 52 | 450 |
No. 2–2 | 1,200 | 810 | 69 | 450 |
Table 2 Actual production process parameters of tested steels
Steel | Heating temperature (°C) | Finish rolling temperature (°C) | Cooling rate (°C/s) | Coiling temperature (°C) |
---|---|---|---|---|
No. 1–1 | 1,200 | 818 | 46 | 450 |
No. 1–2 | 1,200 | 830 | 50 | 450 |
No. 2–1 | 1,200 | 810 | 52 | 450 |
No. 2–2 | 1,200 | 810 | 69 | 450 |
Steel | YS (MPa) | TS (MPa) | Ratio of YS/TS | Elongation (%) |
---|---|---|---|---|
No. 1–1 | 620 | 754 | 0.82 | 29.2 |
No. 1–2 | 650 | 770 | 0.84 | 23.2 |
No. 2–1 | 580 | 650 | 0.89 | 33 |
No. 2–2 | 605 | 680 | 0.89 | 30 |
Table 3 Mechanical properties of the tested steels
Steel | YS (MPa) | TS (MPa) | Ratio of YS/TS | Elongation (%) |
---|---|---|---|---|
No. 1–1 | 620 | 754 | 0.82 | 29.2 |
No. 1–2 | 650 | 770 | 0.84 | 23.2 |
No. 2–1 | 580 | 650 | 0.89 | 33 |
No. 2–2 | 605 | 680 | 0.89 | 30 |
Fig. 4 TEM micrographs of polygonal ferrite in No. 2–1 steel a, acicular ferrite in No. 2–2 steel b, dislocation in the acicular ferrite in No. 2–2 steel c
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