Super austenitic steels

TP 904L • UNS N08904 • 1.4539 • TPS-Technichromo 904L

Datasheet

This high-alloy austenitic is very resistant to attack from diluted sulphuric acid, phosphoric acid and acetic acid. It resists pitting in neutral chloride solutions. Its resistance to stress corrosion cracking in some hot chlorides is much superior to that of the lower nickel austenites. This steel has good formability and weldability. This material is present in all common standards like ASTM and EN, however with some differences. Design stresses up to 370°C are included in ASME II.

Chemical composition • mass in %

Material grade Norm C
max.
Si
max.
Mn
max.
P
max.
S
max.
Cr Ni Mo Ti others
1.4539 EN 10216-5 0,020 0,70 2,00 0,030 0,010 19,00 - 21,00 24,00 - 26,00 4,00 - 5,00 Cu 1,20 – 2,00; N 0,15 max.
1.4539 VD-TÜV 421 0,020 0,70 2,00 0,030 0,015 19,00 - 21,00 24,00 - 26,00 4,00 - 5,00 Cu 1,20 – 2,00; N 0,04 -0,15 max.
N08904 ASTM A 213 0,020 1,00 2,00 0,040 0,030 19,00 - 23,00 23,00 - 28,00 4,00 - 5,00 Cu 1,00 – 2,00; N 0,10 max.

Mechanical properties and heat treatment

Material grade Norm Rp 0,2 MPa
min.
Rp 1,0 MPa
min.
Rm MPa
min. max.
A
min.%
Hardness
HRB max.
Heat treatment
1.4539 EN 10216-5 230 250 520 - 720 35 solution annealed
1.4539 VD-TÜV 421 230 260 530 - 720 35 solution annealed
N08904 ASTM A 213 215 490 35 90 solution annealed

Rp 0,2 = Rotation

Rp 1,0 = Yield Strength

Rm = Tensile Strength

A = Elongation

Tolerances

OD - Tube OD WT special WT ID
ab Ø4,55 mm ±0,050 mm ±0,150 mm ±0,100 mm X
ab Ø9,53 mm ±0,050 mm ±0,100 mm ±0,080 mm ±0,050 mm
ab Ø30,00 mm ±0,100 mm ±0,150 mm ±0,050 mm

Scope of dimensions*

* Dimensions not shown on request

WD [mm] 1,00 1,20 1,24 1,30 1,40 1,50 1,60 1,65 1,82 2,00 2,11 2,20 2,30 2,35 2,41 2,64 2,77 2,80 3,00 3,20 3,25 3,50 3,60 3,85 3,91 4,00
AD [inch] 0,048 0,065 0,072 0,083 0,093 0,095 0,104 0,109 0,126 0,128 0,154
[mm] [inch]
8,00
9,00
9,53 0,375
10,00
11,00
12,00
12,70 0,500
13,00
14,00
15,00
15,88 0,625