JX-21JG428-21.4-5.55-ST, CNC carbon steel machining auto parts nuts, round nuts, auto parts manufacturing application solutions, surface treatment electroplating environmental protection ROHS color zinc

1, # 45 steel a high-quality carbon structural steel, medium carbon steel, a carbon content of 0.4% or more, not high hardness and easy cutting, usually by hot-rolled or cold-rolled forming;

2, tensile strength > 686MPa, yield strength > 490MPa;

3, the quenched hardness between HRC20-HRC30, is quenched to ensure superior mechanical properties, but the surface hardness is low and not wear-resistant, and cutting performance will be reduced;

4, quenched hardness between HRC55-58, the limit value can reach HRC62, but will make the original mechanical properties reduced;

5, after carburizing treatment can improve the surface wear resistance;

6, the general use of quenching + surface quenching to adjust the hardness of the surface treatment of parts, making a good overall performance.

Commonly used surface treatment, heat treatment methods: 

1, tempering;

2, quenching + surface quenching;

3, carburizing;

4, black zinc plating;

5、Chrome plating (hard chrome plating).

Disadvantages: 

1, the surface is easy to rust, rust resistance is much worse than stainless steel and aluminum, and there are clean room requirements occasions can not be used.

Applications: 

1, after tempering treatment is generally used for the manufacture of higher strength requirements, not very large force machined parts, forgings, stamping parts and nuts, pipe fittings, and other parts;

2, after carburizing treatment is generally used for the surface wear-resistant, core impact-resistant heavy-duty parts, gas wear resistance than quenched + surface quenching high.

Packing: Inner is Poly foam, out is carton. Then pallet. Carton size: 29*19*19.5CM and 23.5*17.5*8, CM and pallet size is: 215*100*90CM, or as your requirement.

Packaging & Delivery and Packaging Details

1. Shrink film+wooden box

2. Cardboard box+pallet

3. Color box

4. As per the customer's request