Description:
1215 free cutting structural steel is a common carbon structural steel, which is widely used in various mechanical manufacturing and parts processing fields. Is a kind of economical and practical, using a wide range of general steel. It has the following main features:
General good strength, tensile strength of about 350-450 MPa, yield strength of about 250-350 MPa, meet the requirements of various industrial applications.
Good cutting performance: The cutting performance of 1215 steel is better, can be easier to turn, milling, drilling and other processing, improve the processing efficiency and product quality. This is mainly because it contains a certain amount of sulfur, phosphorus and other alloying elements, which can form a grain structure that is conducive to cutting.
Wide range of application :1215 steel is widely used in automotive parts, machine tool parts, instrumentation parts, hardware products and other fields, is a kind of strong universal structural steel material.
Economy: the price of 1215 steel is relatively low, and the commonly used abrasive rod material is about 6000 RMB/ton.
Good heat treatment performance :1215 steel can be surface carburized heat treatment, surface hardness up to HV450 or more. (Note: 1215 is only suitable for carburizing surface hardening treatment, heart hardness can not be improved)
1215 is equivalent to Y08 in GB/T8731, 11SMn30 in DIN EN10087, and SUM23 in JIS G4804.
The chemical composition standard of 1215:
1215 chemical composition (refer to SAE J403) :
|
element |
The element name and chemical composition (%) | |||
| Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | |
| 1215(G12150) | ≤0.09 | 0.75-1.05 | 0.04-0.09 | 0.26-0.35 |
Note: certain residual elements shall be agreed between the buyer and supplier. As a guide, examples of residual element limits for different options are as follows:
A (Cu≤0.20%, Ni≤0.20%, Cr≤0.15%, Mo≤0.06%);
B（Cu≤0.35%、Ni≤0.25%、Cr≤0.20%、Mo≤0.06%）；
C (Cu≤0.40%, Ni≤0.40%, Cr≤0.30%, Mo≤0.12%). In addition to Not otherwise specified, otherwise the limit content of residual elements option B.
When lead-Pb elements need to be added to standard steels, the specified range is 0.15% to 0.35% (including 0.35%) such steels are identified by inserting the letter L between the second and third digits of the grade name, such as 12L15.” UNS names can also be used to denote lead by changing the last digit to 4, such as G12154.
Physical properties of 1215 fast cutting steel:
Tensile strength σb (MPa) : ≥420
Yield strength σs (MPa) : ≥220
Elongation δ5 (%) : ≥24
Cross-sectional shrinkage ψ (%) : ≥40
Hardness: ≤190HB
The application field of 1215:
1215 Easy turning steel is mainly used in the production of instruments and meters, watch parts, automobiles, machine tools and other various machines with small force and strict requirements for size and finish, and strict requirements for size accuracy and finish, and relatively low mechanical performance requirements for standard parts. Such as gear, shaft, bolts, valves, bushing, pin, tube connectors, spring seat cushion and machine screw, plastic molding, procedures of surgical and dental appliances, etc.
There is no doubt that the fasteners, especially for the fastener industry is also 1215 is widely applied. Such as: used for automatic cutting machine processing fasteners and standard parts, such as bolt, screw, nut, shaft parts, etc.
The processing performance of 1225:
Cold heading:
It can’t be cold.
Weldability:
1215 weldability is general, its performance is not as good as Q235
Cutting:
Excellent machining of 1215
The advantages of 1215:
1215 easy cutting steel high sulfur content, good cutting performance, plasticity, strength is acceptable. 1215 Free cutting steel products have the following advantages:
Diversity: 1. Shape specification through design different shaped mold, cold-drawn out different cross section shape and specification of tolerance free-cutting steel. Angle can be a right Angle or rounded.
2. High accuracy: the use of high quality carbide die to ensure accurate and uniform tolerance.
3. Smooth surface: advanced cold extrusion technology makes the surface of free cutting steel products smooth and bright.
4. Material of savings: cold drawing process is the raw material of cold extrusion deformation to achieve the required shape, specifications and tolerances, the consumption of raw materials, relative materials, using traditional lathe machining cutting through the free-cutting steel save material and time is very considerable, especially when the dosage of materials, material cost savings.
5. Processing time and processing machinery savings: due to accurate precision, good surface condition, free cutting steel products can be used directly, such as spraying, sand, bending, drilling, and can also be directly electroplated after drawing according to actual requirements, eliminating a lot of machining time and saving the cost of configuration processing machinery.
