TP304 / TP304L
Material
- ◎ TP304, UNS S30400, 1.4301, X5CrNi18-10
- ◎ TP304L, UNS S30403, 1.4307, X2CrNi18-9
Overview
304 steel belongs to low carbon Austenitic type stainless steel, has general intergranular corrosion resistance and excellent corrosion resistance and cold working stamping performance. It has strong corrosion resistance to oxidizing acid (such as nitric acid), and has certain corrosion resistance to alkali solution and most organic and inorganic acids.
304L steel is an ultra-low carbon austenitic stainless steel with superior intergranular corrosion resistance, and the weldments are not prone to knife edge corrosion in the heat affected zone. It has good corrosion resistance in different temperature and concentration of a variety of strong corrosive media (such as nitric acid, most of the organic and inorganic acid aqueous solution, phosphoric acid, alkali, etc.). It has high thermal stability in air below 850℃. It also maintains good mechanical properties in low temperature environment. Its cold deformation, deep stamping, cutting, weldability are very good.
Application
TP304 is used in almost most industrial environments – from decoration, construction industry, basic utility equipment to complex components, subassemblies in the chemical, petrochemical, automotive, machinery, food, and even marine, aerospace and railway industries. As stainless steel, it withstands the working environment and contact with steam, water, ammonia, external conditions, hydrogen sulphide, liquid fuels, sulphur, nitric acid, paints, phenols, some ammonium compounds and sulphates. It is suitable for contact with substances present in food production – tartaric acid, citric acid, oxalic acid, acetic acid, salicylic acid, vegetable preparations, alcohols, fermented products and other organic substances.
TP304 is less able to work in the environment of formic acid, lactic acid, sometimes also acetic acid at higher temperatures/concentrations, semi-finished products for the production of cleaning powders (e.g. borax), most chlorides and inorganic acids, also sulphuric acid, hydrogen chloride, hydrogen fluoride, fluorine, potassium carbonate, sodium carbonate, ammonium nitrate. This also applies to certain liquid metals at high temperatures – lead, cadmium, zinc, and alumina.
The applications of TP304L are mostly the same as TP304.
Chemical composition
TP304 as per ASTM A269
| wt% | C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|---|
| ≥ | 18.00 | 8.00 | |||||
| ≤ | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 20.00 | 11.00 |
TP304L as per ASTM A269
| wt% | C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|---|
| ≥ | 18.00 | 8.00 | |||||
| ≤ | 0.035 | 1.00 | 2.00 | 0.045 | 0.030 | 20.00 | 12.00 |
Mechanical property
| Temper | TP304 | TP304L | ||
|---|---|---|---|---|
| Tensile Rm | 75 | ksi (min) | 70 | ksi (min) |
| Tensile Rm | 515 | MPa (min) | 485 | MPa (min) |
| Rp 0.2% Yield | 30 | ksi (min) | 25 | ksi (min) |
| Rp 0.2% Yield | 205 | MPa (min) | 170 | MPa (min) |
| Elongation (2″ or 4D gl) | 35 | % (min) | 35 | % (min) |
Heat treatment and hardness
Solution treat temperature: 1040°C (1900°F)
Hardness: max. 192 HBW or 200 HV or 90 HRB
Available Process
- ◎ Cold worked
- ◎ Cold worked and bright annealed
- ◎ Cold worked, annealed and pickled
- ◎ Cold worked, polished (MP, EP etc.)
- ◎ Cold worked, bright annealed, polished (MP, EP etc.)
Product forms
Capillary tube
OD 0.08 ~ 6.0 mm
WT 0.015 ~ 1.5 mm
Thin wall & Ultra thin wall seamless tube
OD 0.60 ~ 80.0 mm
WT 0.05 ~ 4.5 mm
Micro ID and heavy wall seamless tube
OD 3.0 ~ 50.0 mm
ID 0.30 ~ 5.0 mm
Precision seamless tube
OD 6.0 ~ 89 mm
WT 0.50 ~ 9.0 mm
Profiled seamless tube
Build to drawing
Build to specification
Precision Conic Seamless Tube
Bigger end: OD3.0 – 28.0mm
Smaller end: OD2.5 – 25.0mm
WT: 0.25 – 1.50mm
HP / UHP BA+ tube
OD 1.0 ~ 76 mm
WT 0.10 ~ 10.0 mm
Bourdon tube
Y40, Y50, Y60, Y70, Y100, Y150
Service
- ◎ Precision cutting
- ◎ Tube surface treatment, like ID surface super mirror polishing, best level could reach Ra0.0015um
- ◎ Tube deep processing, like coiling, bending, end forming, body forming, laser processing, various needles processing, built to drawing and sample, etc.