Special Quenched and Tempered Spring Steel Belt For Saw Blades
For components subjected to high stresses, the combination of high strength, wear resistance and toughness is particularly important. This is the case, for example, with car clutches, safety belt buckles or flat springs for shutter doors and power springs.
The specially quenched and tempered steel strip from Waelzholz Brasmetal meets these requirements. Moreover, it offers outstanding flatness, i.e. zero warping, which is critical for perfect sawing results with stone window sills and for avoiding material loss during use.
Hardness
Unlike the steel for bi-metal hole saws produced by many other manufacturers, our Special quenched and tempered spring steel belt features high ductility – an important factor in the manufacture of precision parts. This enables the bi-metal teeth to be welded to the material without it tearing, as is sometimes the case with conventional hardening and tempering.
In the process, the tempered material is heated to a critical transition temperature above which it is cooled rapidly – in order not to form ferrite, bainite and pearly-lustre. This ensures a high and uniform martensite content, and the resulting high tensile strength and impact toughness values.
This fresh quenching process does not cause environmental pollution, and is simple to implement. It can significantly improve the quality of saw blades, Special quenched and tempered spring steel belt for saw blades shorten delivery cycles, and save energy consumption. The optimum combination of high toughness, tensile strength and wear resistance also makes this material suitable for a variety of other applications. For example, our 75Cr alloy is used to produce tools such as saw blades and diamond cutting blades.
Tensile Strength
The tensile strength of spring steel is very high, allowing the products made from it to withstand compression and bending. This makes them particularly suitable for use in sawing applications. The high yield strength also allows for maximum elongation.
When it comes to cutting materials such as marble and granite, the most important factors for a clean cut are precise edge formation and durability. This is why the backing strip for saw blades made from special quenched and tempered spring steel from Waelzholz has a highly accurate, right-angled edge.
It is easy to achieve this thanks to the inventive handling method of the material: the steel is heated and treated with a saturated sodium chloride solution before quenching. This eliminates the problem of iron scale adhering to the surface of the steel after the heating process. The result is an optimally smooth, even surface that significantly improves the mechanical properties of the material. The tensile and impact toughness of the resulting saw blades are also considerably improved. The tempering also produces a more uniform hardness throughout the entire product.
Toughness
In metallurgy, differential hardening (also called selective quenching, differential tempering, or local hardening) is a process used to increase the toughness of a steel blade while maintaining high strength and sharpness. This is achieved by plunging the sword quickly and vertically into a quenching fluid such as water, avoiding an asymmetric cooling effect which would cause the blade to bend sideways.
OTAI SPECIAL STEEL is a professional 75Cr Spring Steel Strip Coil stockholders and suppliers,we can supply round bar, plate and steel coil with various sizes. The products are widely used in saw blades, cutting tools,hardware and auto-clutches.
Existing medium high carbon saw blade steel heat treatment technology is greatly roller hearth type heating furnace heating, oil spout pressure quench cooling technique, but it can’t solve problems such as, quenching distortion of think gauge steel saw blade, quenching soft spot etc. In order to solve these problems, the present invention provides a heat treatment method for a kind of medium high carbon saw blade steel. The solution is simple, economical, favorable hardenability, efficiency, uniformity and environmental protection, and it can guarantee the required high hardness and toughness of saw blades.
Weldability
The weldability of this particular type of steel is especially beneficial for bi-metal hole saws. These extremely heavy, hard and strong tools must be able to cut through the Tinplate steel coils Manufacturer hardest materials in a very precise manner without tearing. To guarantee this, the backing strip of the saw band must also be characterized by extreme flatness and stability.
To manufacture the spring steel for saw blades, the raw material undergoes various smelting and refining processes. The resulting billets can then be processed by hot rolling and cold rolling to decrease their thickness, increase the grain structure and produce spring steel sheets, strips, rods or bars.
When it comes to the specific heat treatment for the high-performance steel used in our saw blades, we use a method known as Fresh Quenching Process. It is a simple and practical process, and it also does not cause environmental pollution. In addition, this process solves the problem of quenching distortion of thin gauge saw blades and improves the quality of the finished product. It is an important and practical development for the medium carbon low alloy steel industry.
Finish
The quality of the steel strip is crucial for the saw blades to work reliably. The precise strip shape and straightness reduces vibration and wear in the machine, allowing the saw teeth to move perfectly. This increases cutting accuracy and optimum endurance properties. The high level of quality is guaranteed through consistent process control throughout the production.
Domestic large saw blade factory mostly uses greatly roller hearth type heating furnace heating that oil spout pressure quenching cooling technique, during the heat treatment process easily happens martensite transfor mation is insufficient, during Oil injection cooling procedure iron scale seriously hinders saw bit matrix heat transfer and makes it difficult to be diffused into the cooling medium in time,cooling velocity is less than critical hardening cooling velocity,this directly influences every mechanical property of saw bit.
The invention carries out heating pre-treatment with steel to saw blade by using saturated sodium chloride solution, thereby the iron scale in the surface of the steel plate can be automatically washed away and this effectively solves the problems that occur during the heating quenching process of specification saw blade. This improves the quality of saw blade and saves production cost.
