Super Austenitic stainless steel

super austenitic stainless steel 904L tubes pipes,UNS N08094 EN 10216-5 1.4539 Stainless Steel Tubing piping

OD:6-426mm THK:0.5-25mm
SUFACE:AP(Annealed and pickling) / MP(mechanically polish)/BA(bright annealed)
Product description: super austenitic stainless steel 904L tubes pipes,UNS N08094 EN 10216-5 1.4539 Stainless Steel Tubing piping,904L pipes tubes,904L piping tubing,Stainless steel 904L pipes ,stainless steel 904L piping
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Key words

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Tinsi-steel Company profile

Wenzhou TINSI Stainless Steel Co., Ltd is one of the leaders manufacturer & stockist & exporters in stainless steel Pipes &Tubes.our team professional more than 20 years focus on manufacturing stainless steel tubes&pipes and Duplex steel tubes&pipes and Nickel alloy steel tubes&pipes in industrial pipes, precision pipes, sanitary pipes, capillary and needle pipe.

Our company and warehouse in Wenzhou，factory of industrial pipes moved to Songyang,in the stainless steel pipes&tubes that production and sell all control by self,Advanced technology and excellent quality with more than 1200 tons ready stock of industry pipes,offer best price with best services has made TINSI company a true performer in the market domestic.

in 2019，we start foreign business and believe keep always competitiveness that TINSI company will be a reliable partner for worldwide clients.In this new beginning, relying on the advantages of Wenzhou Stainless Steel Base, we also supplies various of stainless steel rods, plates, elbow tees, fittings, flanges, valves and other equipment supporting products for service better and convenient client.

Introduce:
ASTM A213 ASTM B677 N08904 904L EN 10216-5 1.4539 Stainless Steel Tubing is a non-magnetic 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,Phosphoric Acid, Organic Acid, Inorganic Acid.. It is also highly resistant to chloride attack both pitting / crevice corrosion and stress corrosion cracking.
ASME SA213 904L N08904 Stainless steel tubing 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.

904L Stainless Steel 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 Stainless Steel Tubing 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.

Corrosion Resistance of tinsi-steel 904L Stainless Steel EN 10216-5 1.4539 / 904L tubes pipes

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 Stainless Steel Tubing 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.

Heat Resistance of tinsi-steel 904L Stainless Steel EN 10216-5 1.4539 / 904L tubes pipes

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.

904L Stainless Steel Tubing Heat Treatment

Solution Treatment (Annealing) - heat to 1090-1175°C and cool rapidly. This grade cannot be hardened by thermal treatment.

904L Stainless Steel Tubing Welding

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 Stainless Steel Pipe Fabrication

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.

904L Stainless Steel Tubing Applications

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

ASTM A213 904L N08904 1.4539 Stainless Steel Chemical Composition

Table .Composition ranges for 904L N08904 1.4539 Stainless Steel According to ASTM A213 /ASTM A312 and EN 10216-5

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	Cu	N
ASTM A213N08904 904L	min. max.	- 0.020	- 2.00	- 1.00	- 0.040	- 0.030	19.0 23.0	4.0 5.0	23.0 28.0	1.0 2.0	- 0.10
EN 10216-5 1.4539	min. max.	- 0.020	- 2.00	- 0.70	- 0.030	- 0.010	19.0 21.0	4.0 5.0	24.0 26.0	1.2 2.0	- 0.15

904L N08904 Stainless Steel Tubing Mechanical Properties

Table .Mechanical properties of 904L N08904 Stainless Steel.

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
				Rockwell B (HRB)	Brinell (HB)
904L N08904	490	215	35	90	-
Rockwell Hardness value range is typical only; other values are specified limits.

904L N08904 Stainless Steel Tubing Physical Properties

Table. Typical physical properties for 904L N08904 stainless steel tube.

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Co-eff of Thermal Expansion (µm/m/°C)			Thermal Conductivity (W/m.K)		Specific Heat 0-100°C (J/kg.K)	Elec Resistivity (nΩ.m)
			0-100°C	0-315°C	0-538°C	At 20°C	At 500°C
904L	8000	200	15	-	-	13	-	500	850

904L N08904 Stainless Steel Pipe Grade Specification Comparison

Table . Grade specifications for 904L N08904 Stainless Steel Tubes.

Grade	UNS No	Old British		Euronorm		Swedish SS	Japanese JIS
		BS	En	No	Name
904L	N08904	904S13	-	1.4539	X1NiCrMoCuN25-20-5	2562	-
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.

904L UNS N08904 Standard Specification

ASTM B677 - 04 Standard Specification for UNS N08904, UNS N08925, and UNS N08926 Seamless Pipe and Tube
ASTM A213 Seamless ferritic and austenitic alloy steel boiler, superheater and heat exchanger tubes
ASTM A269 Seamless and welded austenitic stainless steel tubing for general service
ASTM A312 Seamless and welded austenitic stainless steel pipes

904L N08904 Stainless Steel Pipe Possible Alternative Grades

Table. Possible alternative grades to 904L N08904 stainless steel tubing.

Grade	Why it might be chosen instead of 904L N08904
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.)
Super duplex	2507 has an higher corrosion resistance is needed, together with a higher strength than 904L.