4 Inch Cold Rolled Stainless Steel Rectangular Pipe AISI SS304 SS321 A312
There are more than 100 different grades of stainless steel but they can be grouped into five major types:
Austenitic is the most widely used type of stainless steel. It has excellent corrosion and heat resistance with good mechanical properties over a wide range of temperatures. Austenitic steel is used in housewares, industrial piping and vessels, construction, and architectural facades.
Ferritic stainless steel has similar properties to mild steel (the most common steel), but better corrosion, heat, and cracking resistance. Ferritic steel is commonly used in washing machines, boilers and indoor architecture.
Martensitic stainless steel is very hard and strong, though it is not as resistant to corrosion as austenitic or ferritic grades. It contains approximately 13% chromium and is used to make knives and turbine blades.
Duplex stainless steel is a composite of austenitic and ferritic steels, making it both strong and flexible. Duplex steels are used in the paper, pulp, shipbuilding, and petrochemical industries. Newer duplex grades are being developed for a broader range of applications.
Martensitic or semi-austenitic steels can also be classified as precipitation hardening stainless steels. These steels are made to be extremely strong with the addition of elements such as aluminum, copper and niobium.
Stainless Steel Rectangular Pipe Specification
| Product Name | 4 Inch Cold Rolled Stainless Steel Rectangular Pipe AISI SS304 SS321 A312 |
| Standard | AISI |
| Length | 2900mm |
| Width | 4inch |
| Height | 2inch |
| Thickness | 0.8mm |
| Dia Tolerance | H9 / H11 / H13 ,or requirement |
| Materials | 201/304 |
| Surface | Bright, pickling ,polishing,annealing,etc |
| Inspection | ISO,BV,SGS,MTC |
| Packing | Waterproof paper, and steel strip packed. Standard Export Seaworthy Package.Suit forall kinds of transport,or as required |
| Supply Ability | 1000 metric tons/month |
| MOQ | 5 metric ton,sample order accepted |
| Shipment time | Within 7-10 workdays after receiving deposit or L/C |
| Payments | T/T,LC |
Elemental comparison of the different materials
| Chemical Composition of Material | Material | 201 | 316L | 304 |
| C | ≤0.15 | ≤0.035 | ≤0.08 |
| Si | ≤1.00 | ≤1.00 | ≤1.00 |
| Mn | 5.5-7.5 | 2 | ≤2.00 |
| P | ≤0.06 | ≤0.045 | ≤0.045 |
| S | ≤0.03 | ≤0.03 | ≤0.03 |
| Cr | 16-18 | 16-18 | 18-20 |
| Ni | 3.5-5.5 | 10-14 | 8-11 |
| Mechanical Property | Material Item | 201 | 202 | |
| Tensile Strength | ≥535 | ≥520 | |
| Yield Strength | ≥245 | ≥205 | |
| Extension | ≥30% | ≥30% | |
| Hardness (HV) | <253 | <253 | |
