409l Stainless Steel Bar

409l stainless steel bar has excellent corrosion resistance, suitable for extending the life of the car and the light weight of the car, high temperature resistance, can achieve high efficiency engine and exhaust system, and reduce the thickness of the exhaust system, can reduce the emission of exhaust gas, can be used as recyclable environmental protection materials. 409L stainless steel low cost, good flexibility, high rate of material, easy to replace, is an environmentally friendly new products.

Production standards

In terms of stainless steel bar rolling standards, the United States, Britain, Germany, France, Russia, Japan and international standards are more advanced, among which the American standard has the strictest dimensional tolerance. The latest standards related to national stainless steel hot-rolled profiles are: American ASTMA276 "Standard Specification for Stainless Steel and Heat-resistant Steel Bars and Sections"; American ASTMA484/A484M "General Requirements for Stainless and Heat-resistant Steel Bars, Billets and Forgings"; German DIN17440 "Technical delivery conditions for stainless steel sheet, hot-rolled strip, wire, drawn wire, steel bar, forging and billet"; Japan JlS64304 "Stainless Steel Bar". In the early 1980s, my country combined the relevant standards of the United States, Japan, Germany, the former Soviet Union and the International Organization for Standardization (ISO), and focused on the Japanese JIS stainless steel bar standard to formulate the national standard GB1220-92 for stainless steel bars, while referring to foreign standards. Standard, the national standard GB4356-84 for stainless steel wire rods has been formulated, which makes the steel series more complete, and adopts international general grades such as the United States and Japan. Some stainless steel grades in my country correspond to American standard grades, as shown in Table 1. At the same time, the commonly used grades in my country are retained, making it basically the same as the stainless steel grades in developed countries such as the United States, and the versatility is stronger. Compared with developed countries, the gap in the standard itself has narrowed a lot, but the surface quality and dimensional tolerance are poor, and the physical level gap is large.

Production Process

Process flow of bar production line: billet acceptance → heating → rolling → double-length shearing → cooling → shearing → inspection → packaging → measurement → storage.

Small bars are produced by small rolling mills. The main types of small rolling mills are: continuous, semi-continuous and tandem. At present, most of the new and in-use small rolling mills in the world are fully continuous. Today's popular rebar mills include general-purpose high-speed rolling rebar mills and 4-slice high-production rebar mills. The billet used in the continuous small rolling mill is generally a continuous casting billet, its side length is generally 130~160mm, and there are also 180mm X 180mm, the length is generally about 6~12 meters, and the single billet weight is 1.5~3 tons. Most of the rolling lines are alternately arranged horizontally and vertically to achieve torsion-free rolling across the entire line. The number of stands is determined according to the principle of rolling one stand. Most of the rolling mills are even-numbered pass combinations. For different billet specifications and finished product sizes, there are 18, 20, 22 or even 24 small rolling mills, and 18 are the mainstream. Adjustable speed, micro-tension and tension-free rolling are the obvious features of modern fully continuous small rolling mills. Part of the racks of rough rolling and intermediate rolling are under micro tension control, and part of the racks and finishing mills of intermediate rolling are under tension-free control to ensure the dimensional accuracy of products. Continuous rolling mills are generally equipped with 6 to 10 loopers, and some even have as many as 12 loopers.

Bar rolling is the easiest of all rolled products to achieve, and it can be done in many ways. Bars can be produced from the three-roller row type to the twisted double type, from various semi-continuous types to full-continuous types, but their output, dimensional accuracy, yield, and pass rate are quite different. The rigidity of the three-roll mill is low, and the fluctuation of heating temperature will inevitably lead to serious fluctuations in product size. In addition, the slow speed of the horizontal row and the long rolling time will lead to an increase in the temperature difference between the head and tail of the rolled piece, which is prone to inconsistent dimensions and uneven performance. The yield is very low, the quality fluctuates greatly, and the high quality rate is extremely low. The full-continuous rolling mill generally adopts horizontal and vertical alternation, the rolling piece has no twist, less accidents, and high output, which can realize large-scale specialized production and structure performance control. The qualification rate has been greatly improved, especially the finished product rate has been improved, and the waste of returning to the furnace for steelmaking has been reduced. At present, new technologies such as stepping heating furnace, high-pressure water descaling, low-temperature rolling, and endless rolling are mostly used in bar rolling. Rough rolling and intermediate rolling are developing in the direction of adapting to large billets and improving rolling accuracy. Mainly to improve accuracy and speed.

Compared with ordinary carbon steel hot rolling, the rolling technology and process know-how of stainless steel are mainly reflected in the inspection and cleaning of ingots, heating methods, roll pass design, rolling temperature control and on-line heat treatment of products.

Stainless steel rod specification

409l Stainless Steel Bar chemical composition

409l Stainless Steel Bar physical properties

Why choose us

Behind the growth and success ofuaima Steel is years of hard work and dedication in the steel industry and meeting customers' needs on time. Advanced technology, standard products, certified quality standards and the best customer service make l is years of hard work and dedication in the steel industry and meeting customers' needs on time. Advanced technology, standard products, certified quality standards and the best customer service make Kuaima Steel a true leader in zhe global marker

Our main export country

We are a well known worldwide exporter of Stainless Steel Rod , Ireland, Portugal, Gambia, Thailand, Ukraine, United Kingdom, Netherlands, South Africa, Spain, Turkey, Italy, Libya, Romania, Puerto Rico, Azerbaijan, United Arab Emirates, Pakistan, Philippines, Ghana, Slovakia, Germany, Saudi Arabia, Afghanistan, China, Bolivia, Switzerland, Bangladesh, Taiwan, Oman, Egypt, Greece, Norway, Singapore, Bulgaria, Estonia, Belgium, Yemen, Hong Kong, Ecuador, Sri Lanka, Nepal, Belarus, Finland, Gabon, Iran, Canada, Argentina, Lebanon.