CrNiMo series easily cut pinion steel and manufacturing method thereof

A gear steel, easy-cutting technology, applied in the field of metallurgy, can solve the problems of poor cutting performance of CrNiMo gear steel, achieve low cost and improve cutting performance

Active Publication Date: 2011-06-01
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly aims at the problem of poor cutting performance of CrNiMo series

Method used

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  • CrNiMo series easily cut pinion steel and manufacturing method thereof
  • CrNiMo series easily cut pinion steel and manufacturing method thereof
  • CrNiMo series easily cut pinion steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: the production of CrNiMo series free-cutting gear steel;

[0038] Firstly, the primary molten steel is melted in the primary smelting furnace, and the steel is tapped in the range of 1600°C to 1650°C, and synthetic slag and pre-deoxidizer are added; secondly, the molten steel is refined in the ladle refining furnace to reduce [O] in the molten steel and the content of inclusions, the temperature is controlled at 1550 ° C ~ 1650 ° C, and the smelting time is within 60 minutes; then the molten steel is vacuum treated on the vacuum furnace, the vacuum degree is less than 76Pa, and the vacuum holding time is 15 ~ 35min. Argon gas is blown into the bottom; finally, continuous casting is carried out under full protection, and after heating for 1.5-4 hours, the slab is hot-rolled at 1180-1260°C into Φ30-160mm round steel.

[0039] See Table 1 to Table 5 for specific parameters. Numbering 1-3 corresponds to the steel type of embodiment 1-3,

[0040] Table 1 gear...

Embodiment 2

[0050] Example 2: Physical properties of steel

[0051] The hardenability of gear steel was determined according to GB / T 225 method, and the high-magnification inspection of gear steel was carried out according to GB / T 13299 method; the strength of gear steel was determined according to GB / T 228; the measurement results are shown in Table 3.

[0052] Table 6 Physical properties of steel

[0053]

[0054] Table 7 rough machining tool life test data table

[0055]

[0056] Table 8 Finishing tool life test data table

[0057]

[0058] It can be seen from Tables 6 to 8 that the gear steel of the present invention has stable hardenability control, good strength and toughness, and is equivalent to existing products and technologies. Its main advantages lie in maintaining high hardenability and good strength. On the basis of toughness, its cutting performance is significantly improved compared with existing products.

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Abstract

The invention relates to a CrNiMo series easily cut pinion steel and a manufacturing method thereof. The steel comprises the following chemical compositions by weight percent: 0.17-0.23% of C, 0.15-0.37% of Si, 0.60-0.95% of Mn, 0.35-0.65% of Cr, 0.35-0.75% of Ni, 0.15-0.25% of Mo, less than or equal to 0.030% of P, 0.010-0.040% of S, 0.005-0.050% of Al, 0.3-0.6% of Ca/S, and the balance of Fe and micro-impurities. The manufacturing method comprises the following steps: smelting in a primary refining furnace (electric furnace or converter); and carrying out LF+VD (ladle refining + vacuum degassing) or RH external refining, continuous casting and rolling, wherein through the external refining and vacuum degassing treatment, the content of the oxygen in the steel is not more than 15*16<-6>,the content of microelement S is controlled, the cutting property of the CrNiMo series pinion steel is improved, and the steel is suitable for speedily cutting and processing important precision parts.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and belongs to the alloy steel category. The invention relates to a CrNiMo series free-cutting gear steel and a manufacturing method thereof. Background technique [0002] 20CrNiMoH is a common CiNiMo series gear steel, and there are similar grades in various countries, such as: SAE (SAE8620H), JIS (SNCM220H), DIN (2NiCrMo2), BS (805M20), NF (20NCD2), etc. Its CrNiMo alloy has low content, good combination of strength and toughness, good hardenability, and can well withstand impact and bending fatigue stress. Widely used in transmission gears and gear shafts of construction machinery and precision machinery. [0003] With the advancement of gear processing technology, many domestic advanced gear manufacturers have been equipped with high-speed CNC machine tools for high-speed cutting and machining of tooth profiles. Higher requirements are put forward for the easy cutting performance of gear...

Claims

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Application Information

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IPC IPC(8): C22C38/44C21C7/10C21C7/06
Inventor 张伟王广连申景霞翟正龙鞠艳美李猛李广艳窦圣朋李法兴
Owner SHANDONG IRON & STEEL CO LTD
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