1. Thickness:0.1mm - 80mm
Width:800mm - 2,000mm
Length:300mm - 12,000mm
3. Grades: 904L
4. PVC film: Novacel(laser cutting)
904L is a non-stabilised low carbon high alloy austenitic stainless steel pipe. The addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulphuric acid. It is also highly resistant to chloride attack both pitting / crevice corrosion and stress corrosion cracking.
904L Stainless steel is designed for harsh environments of the corrosion conditions. Initially stainless steel is developed for corrosion resistance in sulfuric acid. This feature has been verified that is very successful after many years of practical application. Now, 904L in many countries have been standardized.
As the high chromium, nickel, molybdenum and copper content, 904L has excellent corrosion resistance. Such as the uniform corrosion, especially in dilute sulfuric acid.
Other properties included:
- Good resistance to pitting and crevice corrosion ability
- High resistance to stress corrosion cracking capacity
- Good resistance to intergranular corrosion ability
- Good machinability and weldability
This grade is non-magnetic in all conditions and has excellent weldability and formability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperature.
904L does have very substantial contents of the high cost ingredients nickel and molybdenum. Many of the applications in which this grade has previously performed well can now be fulfilled at lower cost by duplex stainless steel 2205 (S31803 or S32205), so it is used less commonly than in the past.
These properties are specified for flat rolled product (plate, sheet and coil) in ASTM B625. Similar but not necessarily identical properties are specified for other products such as pipe, tube and bar in their respective specifications.
Although originally developed for its resistance to sulphuric acid it also has a very high resistance to a wide range of environments. A PRE of 35 indicates that the material has good resistance to warm sea water and other high chloride environments. High nickel content results in a much better resistance to stress corrosion cracking than the standard austenitic grades. Copper adds resistance to sulphuric and other reducing acids, particularly in the very aggressive "mid concentration" range.
In most environments 904L has a corrosion performance intermediate between the standard austenitic grade 316L and the very highly alloyed 6% molybdenum and similar "super austenitic" grades.
In aggressive nitric acid 904L has less resistance than molybdenum-free grades such as 304L and 310L.
For maximum stress corrosion cracking resistance in critical environments the steel should be solution treated after cold work.
Good resistance to oxidation, but like other highly alloyed grades suffers from structural instability (precipitation of brittle phases such as sigma) at elevated temperatures. 904L should not be used above about 400°C.
Solution Treatment (Annealing) - heat to 1090-1175°C and cool rapidly. This grade cannot be hardened by thermal treatment.
904L can be successfully welded by all standard methods. Care needs to be taken as this grade solidifies fully austenitic, so is susceptible to hot cracking, particularly in constrained weldments. No pre-heat should be used and in most cases post weld heat treatment is also not required. AS 1554.6 pre-qualifies Grade 904L rods and electrodes for welding of 904L.
904L is a high purity, low sulphur grade, and as such will not machine well. Despite this the grade can be machined using standard techniques.
Bending to a small radius is readily carried out. In most cases this is performed cold. Subsequent annealing is generally not required, although it should be considered if the fabrication is to be used in an environment where severe stress corrosion cracking conditions are anticipated.
Typical applications include:
· Processing plant for sulphuric, phosphoric and acetic acids
· Pulp and paper processing
· Components in gas scrubbing plants
· Seawater cooling equipment
· Oil refinery components
· Wires in electrostatic precipitators
Table 1.Composition ranges for 904L grade of stainless steel.
|904L||min. max.||- 0.020||- 2.00||- 1.00||- 0.045||- 0.035||19.0 23.0||4.0 5.0||23.0 28.0||1.0 2.0|
Table 2.Mechanical properties of 904L grade stainless steel.
0.2% Proof (MPa) min
(% in 50mm) min
|Rockwell B (HR B)||Brinell (HB)|
|Rockwell Hardness value range is typical only; other values are specified limits.|
Table 3. Typical physical properties for 904L grade stainless steel tube.
|Mean Co-eff of Thermal
|0-100°C||0-315°C||0-538°C||At 20°C||At 500°C|
Grade Specification Comparison
Table 4. Grade specifications for 904L grade stainless steel tubes.
|Grade||UNS No||Old British||Euronorm||Swedish SS||Japanese JIS|
|These comparisons are approximate only. The list is intended as a comparison
of functionally similar materials not as a schedule of contractual equivalents.
If exact equivalents are needed original specifications must be consulted.
Possible Alternative Grades
Table 5. Possible alternative grades to 904L stainless steel tubing.
|Grade||Why it might be chosen instead of 904L|
|316L||A lower cost alternative, but with much lower corrosion resistance.|
|6Mo||A higher resistance to pitting and crevice corrosion resistance is needed.|
|2205||A very similar corrosion resistance, with the 2205 having higher mechanical strength, and at a lower cost to 904L. (2205 not suitable for temperatures above 300°C.)|
|Superduplex||2507 has an higher corrosion resistance is needed, together with a higher strength than 904L.|
Value-added Service of Yieh United Stainless Steel Sheet
Every industry has its unique set of stainless steel sheet specifications and needs. We offer many Value Added Services to meet your needs from cut-to-length to hard-to-find materials and special requirements. With over 13 years in the business, our team is professional at finding out solutions to fit your needs.
Let Yieh United Corporation Be Your Partner！
|Stainless Steel Sheet Beveling||We can cut and bevel the edges of stainless steel sheet to prepare for welding or other processing.|
|Stainless SteelSheet Grinding||We can provide grinding service of stainless steel sheet in order to satisfy customers’ flatness requests.|
|Stainless SteelSheet Polishing||Our stainless steel sheet can be polished to a #4 polish, #6 polish,#7polish, or a #8 mirror finish. It can also be polished on one side or two sides.|
|Stainless SteelSheet Perforating||Our perforated stainless steel sheet comes in a selection of hole shapes, pattern sizes, gauges and grades. It has endless applications such as enclosures,partitions, sign panels, guards, screens, and more.|
|Stainless SteelSheet Laser Cutting||Our technologically advanced laser machines provide us with an efficient, high speed and cost effective form of profiling plate metal which ensures a superior clean cut and oxide free finish.|
|Stainless SteelSheet Water Jet Cutting||We offer stainless steel sheet dynamic water jet cutting in order to process complex part geometry.|
|Stainless SteelSheet Embossing||Our stainless steel embossed patterns including basket embossed pattern,diamond pattern or square pattern.|
|Stainless SteelSheet Decorating||We offer various decorative stainless steel sheet, such as stainless steel mirror plate, stainless steel hairline plate,color coated stainless sheet, etched stainless steel plate, vibration finish stainless steel plate, bead blast finish stainless steel plate, stain brush finish stainless steel plate, and more.|
|Stainless Steel Sheet Heatreating & Annealing||We can heatreat 410 and 17-4PH stainless steel plate to change mechanical properties. In some cases, secondary annealing 300 series might be required depending on the application.|
1. Customized Cutting Machine.
2. Cutting and Leveling Machine for cold rolled coils.
3. Noval Cutting and Leveling Machine for Hot Rolled coils.
SURFACE FINISH OF STAINLESS STEEL SHEET/PLATE :
*Not all finishes are available in all alloys - (contact Yieh United Sales for more information)
|#1 Finish||Hot rolled, annealed and pickled.|
|#2D Finish||A uniform, dull silver gray mill finish that is applied to thinner stainless steel coils,the thickness of which has been reduced by cold rolling.|
|#2B Finish||A semi polished surface achieved by finishing with the equivalent of a 80 to 120 grit abrasive. This finish has a pronounced grit line.|
|#3 Finish||A semi polished surface achieved by finishing with the equivalent of a 80 to 120 grit abrasive. This finish has a pronounced grit line.|
|#4 Finish||Also called brushed, directional or satin finish. A is characterized by fine polishing grit lines that are uniform and directional in appearance. The final abrasive used in the process is 150 to 220 grit.|
|#4 Satin Brush Finish||150 to 180 grit finish A fine directional polish, typically used in the washroom accessories industry. Most 3.5″ floppy diskette cover plates have this finish.|
|#6 Finish||Polished finish achieved with the equivalent of a 240 grit abrasive. Finer grit lines and higher reflectivity than a No. 4 finish.|
|#7 Finish||Highly reflective surface obtained with the equivalent of a 320 grit abrasive. Minimal grit lines.|
|No. 8 or True #8 mirror||This is the most reflective mirror finish on the market. All of the polishing, or “grit,” lines from the preliminary polishing operations are removed. The look is that of a glass mirror. Sometimes referred to as a non directional mirror finish, Super 8, No. 9, Perfect No. 10, and even No. 12 mirror.|
|CMP Super #8 mirror||Chemical Mechanical Polished Super #8 mirror finished sheets are guaranteed to be free from any manufacturing defects. This product represents the ultimate in mirror polished stainless steel. It is available as a single-sided or double-sided mirror polished sheet.|
|Hairline finish||80 – 140 grit finish A well defined directional polish. Starting base substrate is a No. 4 finish sheet; these sheets are polished to provide a “continuous long grain” hairline look. A finish which is popular with architects for its aesthetic, it is equally popular with fabricators due to it’s ease of fabrication and finish matching properties after welding operations.|
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INNOVATIVE TECHNOLOGY of STAINLESS STEEL SHEET/PLATE
At Yieh United Corporation, we never stop improving and developing our technologies to go beyond our customer’s expectations. We strive towards these goals to produce reliable products and ensure they can be fully utilized throughout their lifetime.
PACKING FOR STAINLESS STEEL SHEET/PLATE
Stainless steel products are packed and labeled according to the regulations and customers’ requests.
1. What is the minimum order quantity (MOQ)?
- Normally, the MOQ for our stainless steel sheet is 200 Kg. If we have any excess inventory of stainless steel sheet, there’s no MOQ requirement. You can ask us to check when you are interested in purchasing them.
2.What is the payment method?
- For new customers: 30%T/T deposit 70%T/T Before shipment. – For partners and distributors, 30%T/T deposit 70% T/T Against B/L Copy.
3.What is the acceptable currency?
- We accept USD, EUR and RMB.
4.What is the delivery time?
- 5 days in advance.
5.Where is the loading port?
- Normally, our loading ports are Shanghai, Tianjin, and Shenzhen. You can choose anyone of them, or you can select the other ports.
6.What is the delivery term?
- FOB, CIF, CFR, EXW
7.Do you offer free samples?
- Yes, based on our stock status, we will send our customer free samples. The express fee is to be paid by our customers.
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