Effects of Tempering Temperature on Microstructure and Mechanical Properties of Drill Pipe Steel 26CrMo

doi:10.11900/0412.1961.2016.00406

Acta Metall Sin

2017, Vol. 53

Issue (6): 669-676 DOI: 10.11900/0412.1961.2016.00406

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Effects of Tempering Temperature on Microstructure and Mechanical Properties of Drill Pipe Steel 26CrMo

Zhiqiang SHU¹(

),Pengbin YUAN²,Zhiying OUYANG¹,Danmei GONG¹,Xueming BAI¹

1 Shanghai Hailong Oil Tubular Goods Research Institute, Shanghai 200949, China
2 Hilong Group of Companies Ltd., Shanghai 200949, China

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Zhiqiang SHU,Pengbin YUAN,Zhiying OUYANG,Danmei GONG,Xueming BAI. Effects of Tempering Temperature on Microstructure and Mechanical Properties of Drill Pipe Steel 26CrMo. Acta Metall Sin, 2017, 53(6): 669-676.

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Abstract

The effects of tempering temperature on microstructure and mechanical properties of steel 26CrMo were studied based on mechanical property tests and microstructure observation. The results show that a phase matrix gradually occurs recovery and recrystallization with increasing temperature during 540~690 ℃ temper process, martensite morphology fades away gradually, flake or rocklike carbides separate out along the martensite boundaries, and then change into granulated dispersed distribution, at 690 ℃ tempering carbides happen aggregation and growth on grain boundaries. With tempering temperature increasing, the strength of 26CrMo steel is gradually reducing, plasticity and toughness are gradually increasing. The tensile property and impact energy can meet all different grade drill pipe requirements in API 5DP standard with different tempering conditions. The total impact energy, crack initiation energy and crack propagation energy of 26CrMo steel are gradually increasing with the tempering temperature rising, the crack propagation energy is three times of crack initiation energy which shows great anti-crack propagation capability, but their ratio has no obvious change. The change of impact pro-perty is closely related to the strength and plasticity change, impact toughness stand or fall depends on high or low plasticity.

Key words: drill pipe steel 26CrMo tempering temperature microstructure strength and plasticity properties impact toughness

Received: 09 September 2016

Fund: Supported by Special Fund of Science and Technology Innovation of Baoshan District of Shanghai (No.13-B-3)

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	Zhiqiang SHU
	Pengbin YUAN
	Zhiying OUYANG
	Danmei GONG
	Xueming BAI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00406 OR https://www.ams.org.cn/EN/Y2017/V53/I6/669

Fig.1 OM image of quenched 26CrMo steel

Fig.2 OM image of 26CrMo steel tempered at 540 ℃

Fig.3 Effects of tempering temperature on tensile strength R_m, yield strength R_p and elongation A of 26CrMo steel

Fig.4 Effects of tempering temperature on strain hardening exponent n and uniform deformation capacity U_p of 26CrMo steel

Fig.5 Effect of tempering temperature on yield ratio of 26CrMo steel

Fig.6 Impact force and deflection curves of 26CrMo steel tempered at different temperatures after instrumented Charpy impact test at room temperature (F_m—maximum impact force, S_m—displacement of maximum impact force, S_t—total impact displacement)

Fig.7 Effects of tempering temperature on total impact energy W_t, crack initiation energy W_i and crack propagation energy W_p of 26CrMo steel

Fig.8 Low (a, c, e, g, i) and high (b, d, f, h, j) magnified SEM fractographs of 26CrMo steel tempered at 540 ℃ (a, b), 595 ℃ (c, d), 620 ℃ (e, f), 655 ℃ (g, h) and 690 ℃ (i, j) after impact test at room temperature

Fig.9 SEM images of 26CrMo steel tempered at 540 ℃ (a), 595 ℃ (b), 620 ℃ (c), 655 ℃ (d) and 690 ℃ (e)

Fig.10 Effects of tempering temperature on R_m and F_m of 26CrMo steel

Fig.11 Effects of tempering temperature on n and S_m of 26CrMo steel

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