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carbonitriding

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Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005762
EISBN: 978-1-62708-165-8
... Abstract Carbonitriding is a modified form of carburizing that involves the introduction and diffusion of atomic nitrogen into the surface steel during carburization. This article discusses the composition, depth, and hardenability of a carburized case, and demonstrates how to control...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005811
EISBN: 978-1-62708-165-8
... Abstract Carburization is the process of intentionally increasing the carbon content of a steel surface so that a hardened case can be produced by martensitic transformation during quenching. Like carburizing, carbonitriding involves heating above the upper critical temperature to austenitize...
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Published: 01 August 2013
Fig. 11 Effects of temperature and of duration of carbonitriding on effective case depth. Both sets of data were obtained in the same plant. Note that the graph in (a) (for 1020 steel) is in terms of total furnace time, whereas the graph in (b) (for 1112 steel) is for 15 min at temperature. More
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Published: 01 August 2013
Fig. 16 Effect of ammonia content of carbonitriding gas on hardness gradient More
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Published: 01 August 2013
Fig. 23 Effect of carbonitriding temperature on dimensional stability of three 1010 steel production parts. Parts were carbonitrided to produce a case depth of 0.13 to 0.20 mm (0.005 to 0.008 in.) with minimum surface hardness of 89 HR15N. Gas ratios and dewpoints were essentially the same More
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Published: 01 January 1990
Fig. 13 Effect of porosity on carbonitriding. Compacts of F-0000 powder were pressed and sintered to various densities, then carbonitrided. Hardness traverses reflect both depth of carbonitrided case and density of compacts. Hardness traverse for a carbonitrided specimen of wrought 1018 steel More
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Published: 01 October 2014
Fig. 44 Deep case hardening combining carburizing and carbonitriding/nitriding. Source: Ref 52 More
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Published: 01 January 1990
Fig. 11 Effect of carbonitriding to increase retained austenite on rolling-contact fatigue. Source: Ref 3 More
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Published: 01 December 1998
Fig. 13 Effects of temperature and of duration of carbonitriding on effective case depth. Both sets of data were obtained in the same plant. Note that upper graph (for 1020 steel) is in terms of total furnace time, whereas bottom graph (for 1112 steel) is for 15 min at temperature. More
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Published: 01 December 1998
Fig. 18 Effect of porosity on carbonitriding. Compacts of F-0000 powder were pressed and sintered to various densities, then carbonitrided. Hardness traverses reflect both depth of carbonitrided case and density of compacts. Hardness traverse for a carbonitrided specimen of wrought 1018 steel More
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Published: 01 October 2014
Fig. 7 Depth of carbonitrided cases as a function of boosting time and temperature More
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Published: 01 August 2013
Fig. 10 Wear characteristics of carburized, carbonitrided, nitrocarburized, and untreated 0.2% C steel. Source: Ref 6 More
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Published: 01 August 2013
Fig. 25 End-quench hardenability curve for 1020 steel carbonitrided at 900 °C (1650 °F) compared with curve for the same steel carburized at 925 °C (1700 °F). Hardness was measured along the surface of the as-quenched hardenability specimen. Ammonia and methane contents of the inlet More
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Published: 01 August 2013
Fig. 2 Typical carbonitrided surface with carbon predominating in a martensitic case. Carbonitriding temperature was 850 °C (1560 °F). Source: Ref 5 , 6 More
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Published: 01 August 2013
Fig. 7 Layer analysis of carburized and carbonitrided mild steel. Circle: carburized at 0.12% CO 2 for 4 h at 925 °C (1695 °F). X: carbonitrided at 0.12% CO 2 for 4 h at 925 °C (1695 °F) plus 10% NH 3 . Source: Ref 11 More
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Published: 01 August 2013
Fig. 13 Hardenability comparison of carburized and carbonitrided steel. Jominy specimens of base steel (0.08 % C, 0.19% Si, 0.40% Mn) were austenitized at 820 °C (1510 °F) for 30 min. Source: Ref 9 , 14 More
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Published: 01 August 2013
Fig. 14 End-quench hardenability curve for 1020 steel carbonitrided at three different temperatures compared with curve for the same steel carburized at 925 °C (1700 °F). Hardness was measured along the surface of the as-quenched hardenability specimen. Ammonia and methane contents More
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Published: 01 August 2013
Fig. 15 Hardness gradients in 1117 steel carbonitrided at 815 °C (1500 °F) for 1 1 2 h and quenched in oil. Required minimum hardness of 630 HK (55 HRC) at 0.025 mm (0.001 in.) below the surface was met by reducing the percentage and flow rate of ammonia or by adding a diffusion More
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Published: 01 August 2013
Fig. 18 Retained austenite in 1018 steel carbonitrided at three different temperatures. Bar 28.5 mm (1 1 8 in.) in diameter quenched in 55 °C (130 °F) oil. See also Table 3 . Source: Ref 16 More
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Published: 01 August 2013
Fig. 19 Effect of low-temperature hold on retained austenite in carbonitrided 8617 steel bar. (a) Carbonitrided 4 h at 845 °C (1550 °F) in 8% ammonia, 8% propane, and remainder endothermic gas. Oil quenched and tempered 1.5 h at 150 °C (300 °F). Structure is tempered martensite (dark More