The reporter was informed that the Ministry of Environmental Protection, the National Development and Reform Commission, the Ministry of Industry and Information Technology and the State Administration of Quality Supervision, Inspection and Quarantine and other four ministries and commissions will issue an announcement on the implementation of the light vehicle implementation of the national five, on the on-board diagnostic system (OBD system) nitrogen oxide (NOx) monitoring and actual monitoring frequency (IUPR) Request. Heat Treated Steel Bar And Tube
HEAT TREATED STEEL BAR AND TUBE
Heat treated steel bar is produced by heating and cooling in different temperature based on the steel grades to improve the steel bar mechanical properties or machinability for various industrial applications. Heat treated steel bar includes annealed steel bars, Normalized Steel Bar, quenched and temper qt steel bar.
Annealed Steel Bar has better ductility and lower hardness, which can be easier to be machined. The annealing processing is usually widely used for steel grade with higher carbon content above 0.5%. However, some low carbon steel also requires to do annealing for special usage such as 20CrMnTi gear steel. For some special material such as 20CrMnTi gear steel and GCr15 such bearing steel, spheroidizing annealing is often required.
Normalized steel bar sometime is also one kind of annealing processing. It mainly changes the grain to remove the impurities in steel and improves the strength and hardness. For some hot rolled steel bars, to keep the basic mechanical properties, normalizing is often used.
Quenching and Tempering, abbreviated as Q&T is a king of processing that strengthen or harden steel bars by heating the materials and then cooling in water, oil or other liquid medium, that rapidly the change from austenite to perlite to get the proper properties for various usage. The quenched & tempered steel bar materials are usually with carbon from 0.30% - 0.60%, it is widely used as merchant bars in components of various machines.
Our advantages on producing heat treated steel bars:
1) Big stocks of hot rolled round bars or wire rods as raw materials
2) Wide range of Cold Drawn Steel Bar sizes: from 10mm to 150mm
3) Different cold drawing medias powder or oil to get different surface
4) Straightening machines to get better straightness up to 0.5mm/m
5) Grinding and polishing machines to get better roughness upto 0.4um
6) Heat treating furnaces to adjust the mechanical properties
7) Full sets of testing equipment to test the sizes, mechanical properties and microstructure.
8) Multiple packages to avoid broken packages and anti-rusty
4140 steel tube,Round Steel Tubing,Heat Treated Steel Tube,Heat Treated Steel Bar And Tube,S355JR steel tube SHANDONG LE REN SPECIAL STEEL CO., LTD. , https://www.sdthreadedrods.com
Announcement:
1. Since January 1, 2015, the application for the national five new models that do not meet the requirements for the five-stage emission standard for light vehicles will be discontinued.
2. Since January 1, 2015, the implementation of light-duty vehicles in the country of five countries, sales and registration of domestic and imported light vehicles must meet the requirements of the fifth phase of the light vehicle emission standards for OBD system NOx monitoring and IUPR.
3. Since January 1, 2018, light vehicles imported, manufactured, sold and registered nationwide must meet the requirements for the NOx monitoring and IUPR of the OBD system in the fifth phase of the light vehicle emission standards. The relevant national five model announcements and compulsory certifications that do not meet the standard requirements.
A person from the Ministry of Environmental Protection said that the announcement will be released within the same day. 