Austenitic steels

S31254 • 1.4547 • TPS-INOX 4547-254

Datasheet

UNS S31254 is an austenitic grade in which the additions of chromium, molybdenum and nitrogen give high resistance to pitting in sea water. This alloy has a mean Pitting Resistance Equivalent Number (‚PREN‘ = Cr+3.3Mo+16N) of 43.8. Tests indicate high resistance to crevice-corrosion attack in seawater and to stress corrosion cracking in hot concentrated sodium chloride. Compared with CrNiMo 17 12 2.5 steels, it shows superior corrosion resistance in many acids at similar concentrations and its yield strength is approximately 50% higher. Good weldability using Ni-Cr-Mo consumables. Quench annealing and short periods within the 600-1000°C range avoids the possible development of deleterious sigma phase, which may embrittle and impair corrosion resistance.

Chemical composition • mass in %

Material grade Norm C
max.
Si
max.
Mn
max.
P
max.
S
max.
Cr Ni Mo Ti others
1.4547 EN 10216-5 0,020 0,70 1,00 0,030 0,010 19,50 - 20,50 17,50 - 18,50 6,00 - 7,00 N 0,18-0,25; Cu 0,50-1,00
TP347 ASME SA / ASTM A 213 0,020 0,80 1,00 0,030 0,010 19,50 - 20,50 17,50 - 18,50 6,00 - 6,50 N 0,18-0,22; Cu 0,50-1,00

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
1.4547 EN 10216-5 205 240 510 - 740 35 solution annealed
TP347 ASME SA / ASTM A 213 310 675 35 96 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] 0,89 1,00 1,20 1,24 1,65 1,82 2,00 2,11 2,30 2,35 2,50 2,60 2,64 2,77 2,87 3,00 3,20 3,25 3,60 3,85 3,91 4,00 4,40 5,50 6,35 7,00
AD [inch] 0,035 0,048 0,065 0,072 0,083 0,093 0,104 0,109 0,113 0,126 0,128 0,154 0,250
[mm] [inch]
6,00
6,35 0,250
7,00
7,50
8,00
9,00
9,53 0,375
10,00
11,00
12,70 0,500
13,00
15,00
15,88 0,625
16,00
16,80
17,15 0,675
18,00
19,00
19,05 0,750
20,00
21,34 0,840
22,00
22,23 0,875
23,00
25,00
25,40 1,000
26,00
26,67 1,050
28,00
30,00
31,75 1,250
32,00
33,40 1,315
36,00
38,10 1,500
42,00
44,50 1,750

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