Tool - manufacturing Scenario: When manufacturing hand tools such as screwdrivers and wrenches, it is necessary to consider the situations where the tools frequently come into contact with, rub against other objects and apply torque during use. For these tools, a relatively high hardness is generally required to resist wear and deformation. For example, the hardness of an ordinary screwdriver tip is required to be between HRC40 - HRC50 so that the tip can maintain its shape and not be easily worn or damaged when tightening screws.

 

Mold - manufacturing Scenario: In the field of mold manufacturing, different types of molds have different hardness requirements. Injection molds need to withstand the high pressure and friction of plastic melts, and their surface hardness is usually required to reach HRC45 - HRC55. Die - casting molds, due to having to withstand higher pressure and temperature as well as the scouring of liquid metal, have a higher hardness requirement, generally between HRC50 - HRC60. Such hardness can ensure that the molds maintain dimensional accuracy during repeated use, reduce wear and deformation, and thus guarantee the quality of plastic products or die - cast parts.

 

 

 

: Different industries have their own hardness standard specifications. For example, the machinery - manufacturing industry usually refers to standards such as ISO and GB (Chinese National Standards) to determine the hardness requirements of parts. Take gear manufacturing as an example. According to the GB/T 10095 - 2018 standard, for involute cylindrical gears for general purposes, the tooth - surface hardness is required to be between HRC48 - HRC55. This is to ensure that the gears have good wear resistance and anti - fatigue performance during the power - transmission process.

 

 

 

 

KR/R D51high Strength Chemical Composition
	C			P	S		N
KR/R D51	0.20	0.55	1.70	0.030	0.030	-	0.020
		V
	-	-	-	-	-	-	-

 

 

 

 

: When determining the hardness - performance target, the balance between hardness and toughness must be considered. If only high hardness is pursued, the material may become brittle and prone to fracture when subjected to impact. For example, when manufacturing cutting tools, if the hardness is increased to above HRC65, although the wear resistance of the tool is excellent, chipping may occur when cutting harder materials or when subjected to unexpected impact. Therefore, it is necessary to reasonably adjust the hardness according to the possible impact situations that the product may encounter during actual use to ensure that the material has a certain hardness while maintaining sufficient toughness. Generally speaking, for tools or components that need to withstand a certain impact, the balance between hardness and toughness can be achieved by controlling the carbon content, adding alloy elements and appropriate heat - treatment processes.

 

: High - hardness materials bring some challenges during the machining process. For example, steel with too high hardness will accelerate tool wear during cutting, increasing the machining cost. Therefore, when determining the hardness target, the subsequent machining process should be considered. If the machining process is mainly cutting, the hardness target should be appropriately reduced, or the material should be pre - treated appropriately before machining, such as annealing treatment to reduce the hardness before machining. At the same time, the heat - treatment and other processes after machining to restore and increase the hardness should also be considered to meet the hardness requirements of the final product.

 

 

 

 

 

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