ASTM A312 TP304L Stainless Steel Seamless Pipe for Petrochemical
Application
YUHONG GROUP deal with Austenitic Stainless Steel, Nickel Alloy
Steel(Hastelloy , Monel, Inconel, Incoloy ) seamless and welded
pipe and tube already more than 33 years, every year sell more than
80000 tons of steel pipe and tube. Our client already cover more
than 55 countries, Like Italy, UK, Gernmany, USA, Canada, Chile,
Colombia, Saudi Arabia, Korea, Singapore, Austrial, Poland,
France , ....And our group branch company and factory have been
already approved by :ABS, DNV, GL, BV, PED 97/23/EC, AD2000-WO,
GOST9941-81, CCS, TS, CNNC, ISO9001-2008, ISO 14001-2004.
Description
Grade304 is the standard "18/8" stainless; it is the most versatile
and most widely used stainless steel, available in a wider range of
products, forms and finishes than any other. It has excellent
forming and welding characteristics.. It is an austenitic stainless
steel and has chromium content in it. This makes the ASTM A312
Grade Tp304l corrosion resistant. This quality is desired in most
applications.
The grade 304L can be used in mild chemicals with less acidity and
less oxidation and reduction capacity. Food and beverages
industries often deal with mild acids like carbonic acids, citric
acid and tartaric acids. These are found in food items and are mild
acids that do not corrode the 304L Pipe. The material has 18%
chromium and 8% nickel along with other additions but with less
carbon than the ordinary SS304 Pipe material.
304L is a variant of 304 stainless steel with lower carbon content
and is used where welding is required. The lower carbon content
minimizes the precipitation of carbides in the heat-affected zone
near the weld, and the precipitation of carbides may cause
stainless steel to produce intergranular corrosion (welding
erosion) in certain environments.
304L stainless steel has poor forging performance and difficult
deformation.
Due to work hardening. So that the amount of deformation in the
process of mandrel drawing can not be too large. And the heat loss
is large. Therefore, it must be formed under many fires. If the
high temperature holding stage is not handled well, it will cause
coarse crystals.
Chemical Composition
| Weight % | C | Mn | P | S | Si | Cr | Ni |
| 304L | .035 | 2.00 | .045 | .030 | 1.00 | 18.0-20.0 | 8.0-13.0 |
Mechanical Properties
| Grade | Tensile |
| | Ultimate/Min | Yield/Min | Elongation/Min |
| | KSI | MPA | KSI | MPA | % |
| 304L | 70 | 485 | 25 | 170 | 35 |
Physical Properties
| Grade | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Density (kg/m3) | Elastic Modulus (GPa) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) |
| 0-1000C | 0-3150C | 0-5380C | at 1000C | at 5000C |
| 304L | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 8000 | 193 | 500 | 720 |
Equivalent Grade
Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS |
BS | En | No | Name |
304L | S30403 | 304S11 | 58E | 1.4301 | X5CrNi18-10 | 2332 | SUS 304L |
Inspection & Tests
Visual examination, dimensional inspection, PMI chemical analysis,
tensile test, flattening test, bend test, eddy-current test,
etching test, radiographic examination (for welded pipes),
intergranular corrosion test (upon request).
Apllication
The grade 304L steel can be made into plates, sheets, and coils to
be used in the following:
- Food processing equipment, particularly in beer brewing, milk
processing & wine making
- Kitchen benches, sinks, troughs, equipment and appliances
- Architectural panelling, railings & trim
- Chemical containers, including for transport
- Heat Exchangers
- Woven or welded screens for mining, quarrying & water
filtration
- Threaded fasteners
- Springs
