The stainless steel tube can be classified into a Cr system (400 series), a Cr-Ni system
(300 series), a Cr-Mn-Ni (200 series), and a precipitation hardening system (600 series). 200 series - chrome-nickel-manganese
austenitic stainless steel, 300 series - chrome-nickel austenitic stainless steel.
301-----extension is good for molding products. It can also be hardened by mechanical processing. Good weldability. Wear
resistance and fatigue strength are better than 304 stainless steel.
302-----corrosion resistance is the same as 304, because the carbon content is relatively high and the strength is better.
303-----It is easier to cut than 304 by adding a small amount of sulfur and phosphorus.
304-----that is 18/8 stainless steel. The GB grade is 0Cr18Ni9. 309 - Better temperature resistance than 304.
316-----After 304, the second most widely used steel grade, mainly used in the food industry, the pharmaceutical industry and
surgical equipment, added molybdenum to obtain a special structure resistant to corrosion.
321 - Other properties are similar to 304 except that the addition of titanium reduces the risk of corrosion of the material weld.
400 series - ferritic and martensitic stainless steel.
408-Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
409-The cheapest model, usually used as a car exhaust pipe, is a ferritic stainless steel (chrome steel).
410-Martensite (high-strength chrome steel) with good wear resistance and poor corrosion resistance.
416-The addition of sulfur improves the processing properties of the material.
420-"cutting grade" martensitic steel, similar to the earliest stainless steel of Brinell high chromium steel. Also used for
surgical knives, it can be done very brightly.
430 - ferritic stainless steel, for decoration, for example for automotive accessories. Good formability, but poor temperature
resistance and corrosion resistance.
440-High-strength cutting tool steel with slightly higher carbon content. After proper heat treatment, it can obtain higher yield
strength and hardness can reach 58HRC, which is among the hardest stainless steel. The most common application example is the
"razor blade." There are three commonly used models: 440A, 440B, 440C, and 440F (easy processing type).
500 series - heat resistant chrome alloy steel.
600 Series - Martensitic precipitation hardened stainless steel tube.

Shandong Runhai Stainless Steel Co., Ltd.   is located in Jinan city, Shandong Province, with a registered capital of 51.17 million yuan. Is a set of domestic trade, foreign trade in one of the professional steel sales company. The company's products include stainless steel, seamless tube, color coated plate, galvanized plate, aluminum plate, aluminum plate, copper plate and other profiles, building materials, pipe series. The products are widely used in chemical, pharmaceutical, electric power, railway, automobile, paper making and construction engineering. The company has long-term and close trade relations with shandong Iron and Steel, Tangshan Iron and Steel, Handan Iron and Steel, Jinxi iron and steel and other well-known domestic steel companies. The company has advanced WMS, CRM management system, to ensure that our customers in the whole process of product consulting, procurement, ordering, use without worry!

1. Who are we?
We are based in Shandong, China, start from 2023,sell to Southeast Asia(20.00%),North America(15.31%),Africa(13.00%),South
America(11.27%),Eastern Europe(10.31%),South Asia(10.00%),Oceania(5.00%),Central America(5.00%),Southern Europe(3.11%),Western
Europe(3.00%),Mid East(1.00%),Eastern Asia(1.00%),Northern Europe(1.00%),Domestic Market(1.00%). There are total about 5-10 people
in our office.

2. How can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3.What can you buy from us?
Carbon steel pipe,Carbon steel plate,Carbon steel coil,Carbon steel rods,Carbon steel material

4. Why should you buy from us not from other suppliers?
Our company has advanced production equipment, can meet customer customized service requirements, product quality and delivery speed are the world's leading level.

5. What services can we provide?
Accepted Delivery Terms: FOB,CIF,EXW,FAS,CIP,FCA,CPT,DEQ,DDP,DDU,Express Delivery,DAF,DES;
Accepted Payment Currency:USD,EUR,JPY,CAD,AUD,HKD,GBP,CNY,CHF;
Accepted Payment Type: T/T,L/C,D/P D/A,MoneyGram,Credit Card,PayPal,Western Union,Cash,Escrow;
Language Spoken:English,Chinese,Spanish,Japanese,Portuguese,German,Arabic,French,Russian,Korean,Hindi,Italian