Key Factors When Purchasing 65Mn Carbon Steel Sheets

The quality requirements for 65Mn carbon steel strip are varied, and single specification usage is limited. The existing large-scale production of 65Mn cold-rolled steel by steel mills cannot meet the personalized needs of end customers, leading many manufacturers to seek customized 65Mn carbon steel strip. So, what should be noted when purchasing 65Mn cold-rolled sheets?

Clarify the ultimate purpose

When communicating with 65Mn suppliers, it is advisable to inform them of the final use of the product. This will enable the supplier to provide preliminary opinions based on product drawings and to confirm specific parameters with steel plant technicians. This will help to avoid producing 65Mn that is not suitable for the final product. To illustrate, the procurement personnel placed an order with us in accordance with the production requirements of the factory. The 65Mn cold-rolled sheet was 1.2mm x 720mm x C with a hardness of approximately HRC25. The product was shipped in accordance with the customer’s specifications. However, upon bending it at 50 degrees, cracks were discovered. Following communication with the customer, we learned that the highest hardness limit requested was HRC25, and that annealed 65Mn cold-rolled sheets would be more suitable.

Clearly define the tolerance range

Our domestic manufacturing technology is undergoing constant development, and the requirements for raw materials are also increasing. A significant number of mechanical parts manufacturers receive orders from overseas customers, including Tesla and Toyota, for the production of 65mn cold-rolled products. Their product tolerances comply with European and American technical standards, particularly in regard to thickness tolerances, which are subject to particularly strict requirements.We now have a number of customers to produce spring shims, 0.5mm thickness tolerance range required to control the (0.03mm / -0.03mm). This is significantly more exacting than our usual delivery standard. Initially, the customers were reluctant to accept the order. Subsequently, ZGT steel engaged in repeated communication and collaboration with the steel mill, implementing numerous process changes to meet the customer’s requirements. The products were delivered to the customer with stable quality and ultra-high precision results, thereby securing a significant market share for the customer’s products.

Clearly define the delivery hardness

The delivery hardness of 65mn hot-rolled is 240-270HB. The delivery hardness of 65mn cold-rolled soft is 190-220HB. The delivery hardness of 65mn cold-rolled hard is 300-340HB. The hardness of the material has a direct impact on the subsequent processing quality, and the hardness requirement is a crucial parameter. Consequently, ZGT Steel will ascertain the requisite hardness range in advance of placing an order, thus enabling the customer to select the most appropriate material.

Other elements

When purchasing 65mn, it is also necessary to pay attention to the surface requirements,tensile strength, and packaging methods of material delivery. Some customers with high requirements have strict standards for the flatness and corrosion of the board surface. ZGT Steel will conduct quality inspection and take photos for customer confirmation before shipment to ensure that the quality of each batch of materials meets customer requirements.