Carbon cold rolled and hot rolled wire rods are widely used in the manufacturing of fasteners, especially for low-carbon grades such as SWRCH6 to 16A. These non-heat-treated steels are ideal for cold heading and extrusion processes, commonly used in producing various types of fasteners with lower strength requirements. Due to the high deformation involved in cold heading (often exceeding one-third), annealing is recommended for certain steel grades to improve formability. It is advised that customers choose low-carbon grades like SWRCH6A, particularly when dealing with large deformation applications. Additionally, selecting similar wire material specifications helps reduce drawing deformation and minimize work hardening effects. Free return cold rolled steel and hot rolled wire rods have been a focus of research and development in recent years. In 2004, Maanshan Iron & Steel Co., Ltd. participated in the National 863 Program "Research on High Performance and Low Cost Cold Rolled Steel" (2003AA331030), aiming to develop an independent production technology for softening and low-cost cold heading steel wire in China. High-strength fasteners rated at 8.8 and above typically use medium-carbon or medium-carbon alloy steels. The standard production process involves hot rolling, spheroidizing annealing, cold drawing, cold forming, and quenching and tempering. Spheroidizing annealing is crucial to ensure sufficient plasticity for cold heading, which can involve up to 70–80% total deformation. Therefore, the raw material must have low hardness, generally not exceeding HRB82. However, spheroidizing annealing is time-consuming and energy-intensive, often taking 12–24 hours in batch or continuous furnaces. As a result, the industry seeks to simplify or even eliminate this step to improve efficiency and reduce costs. Ma Steel's high-line technology has advanced to include unique hot-rolling processes with independent intellectual property rights. They have developed annealed SWRCH35K-M and CH35A-M, as well as SWRCH35K-MT and CH35A-MT hot-rolled wire rods for fasteners exported to the U.S. market. These products are suitable for manufacturing hex bolts and similar fasteners with moderate cold heading deformation. For high-deformation fasteners, spheroidizing annealing is still necessary. Meanwhile, MFM-1 and MFM-3 hot-rolled wire rods have been developed for ordinary high-strength nuts, while MFM-2 eliminates both annealing and quenching/tempering, directly producing grade 8 nuts. Non-tempered cold heading steel is primarily used for high-strength bolts such as 8.8, 9.8, and 10.9. Using non-tempered cold-rolled steel significantly reduces the production steps by eliminating pre-drawing annealing and post-bolting quenching/tempering. This simplifies the process, shortens the cycle, saves energy, and avoids issues like oxidation, decarburization, and deformation from heat treatment. Japan has already implemented industrial mass production of such materials. In 2005, Maanshan Iron & Steel Co., Ltd. took part in the National 863 Program Guided Project “Research and Development of Non-tempered Steel Wire for Low Temperature Controlled Rolling and Controlled Cooling Fasteners†(2005AA001110). In 2008, they also undertook the National Support Program Project “Development of Low-Cost, High-Strength Non-Quenched and Tempered Cold-Rolled Steel Products for Steel Structure Joints†(2007BAE30B04). The non-tempered steel series developed by Maanshan Iron & Steel Co., Ltd. utilizes micro-alloying, controlled rolling, and controlled cooling techniques to achieve ultra-fine grain structures. This allows the wire rods to skip both raw material annealing and final fastener processing, meeting current mechanical performance standards (GB/T 3098.22-2009). This new production route for high-strength fasteners (grades 8.8–10.9) offers significant economic and environmental benefits, reduces energy consumption, and minimizes defects like quenching cracks and surface decarburization. Alloy cold heading steels such as 10B21, ML40Cr, and SCM435 are mainly used for high-grade fasteners ranging from 8.8 to 12.9. Through strict process control, these materials offer superior performance and cost-effectiveness, making them ideal for critical applications requiring high strength and reliability. DIN11850 Stainless Steel Sanitary Pipes is the main tubing line for a piping system. Generally, DIN11850 Stainless Steel Sanitary Pipes are made in stainless steel 304 and 316L, but we provide other grade too such as hastelloy C22, 316Ti, Titanium and nickel alloy etc. Kaysen offer both sanitary seamless tubes and Sanitary Welded Tubes to ASTM A270, ASTM A249, A269, ASTM A554, DIN11850, and size is up to 12″. Inner and outer surface is polished to meet the high purity requirement of hygienic industries. Kaysen is ability to supplying qualified DIN11850 Stainless Steel Sanitary Pipes comply to your your condition and FDA,GMP requirement. DIN11850 Stainless Steel Pipes,DIN Sanitary Tubes,1.4306 Hygienic Pipes Kaysen Steel Industry Co., Ltd. , https://www.chinasanitaryvalve.com
DIN11850 Stainless Steel Sanitary Pipes - Polished Stainless Steel Tube – Stainless Steel Hygienic Tubes
Material: SS304, SS316L, EN 1.4301, EN 1.4404, etc
OD diameter: 1/2" - 12"
Thickness: 0.5mm - 6mm
Standard: ASTM, JIS, DIN, JIS, SUS, GB
Length: 6m or customer made
Tolerance: OD. ±0.2mm; Thickness: ±0.02mm; Length: ±0.5mm
Surface Treatment: Matt Finish or Mirror Finish (320# 400# 600#) etc
Application: Boiler, heat exchanger, construction, hygienic, pharmacy, power, petrochemical
Strength:
Heat Treatment of solution annealing for the sanitary tubings and fittings are available
High precision on dimension and wall thickness
Both seamless and welded sanitary tubings are available
Length is up to 12 meters.
Min. order quantity of sanitary tubings is from 300Kgs.
Offer industrial pipe and tubes according to order.
PMI test to verify material grade.
Visual and surface 100% examination before shipment.
End protected for shipment.