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| Mailing Address |
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UKF Stainless Ltd
12 Buntsford Park Road
Bromsgrove
Worcestershire
B60 3DX
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| Telephone / Fax |
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| Tel: |
01527 578686 |
| Fax: |
01527 837792 |
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| Email |
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 info@ukfstainless.co.uk |
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1.4542
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Introduction:
17%Cr 4%Ni steels, like
X19CrNi 17 2 (UNS S43100)
transform to martensite on moderately slow cooling.
However, the addition of Nb stabilizes the carbon
and ensures the martensite in 17Cr4Ni4Cu is relatively
soft (320HV) and ductile. It is then easily welded,
readily
machined and can be lightly cold-formed. Strength
can be adjusted by ageing temperature (see metallurgy).
The lower strength variants are more suitable for
direct exposure to mildly corrosive environments,
as the higher strength grades may suffer hydrogen
embrittlement.
Not very resistant to aerated seawater without some
galvanic/cathodic protection.
Metallurgy:
Solution treatment with air or water cooling
from 1025-1055°C followed by reheating to 480-620°C,
strengthens the steel by the precipitation hardening
of copper. Ageing at 480°C produces the highest
strength of 1300-1600 MPa. 550°C gives 1100-1400
MPa and 620°C gives 900-1300 MPa.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
15.50 |
17.50 |
| Nickel |
3.00 |
5.00 |
| Manganese |
- |
1.00 |
| Carbon |
- |
0.07 |
| Copper |
3.00 |
5.00 |
| Niobium |
0.15 |
0.45 |
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Similiar Specifications:
ISO 683/16 1
15.5-17.5%Cr, 3-5%Ni, <1%Mn, <0.07%C, 3-5%Cu,
0.15-0.45%Nb
ASTM UNS S17400 630
15-17.5%Cr, 3-5%Ni, <1%Mn, <0.07%C, 3-5%Cu,
0.15-0.45%Nb
DIN X5 CrNiCuNb 17 4
1.4542
15.5-17.5%Cr, 3-5%Ni, <1%Mn, <0.07%C, 3-5%Cu,
0.15-0.45%Nb
Product Forms:
Bar & long products
ASTM UNS S17400
630 564
General
ISO 683/16 1
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Page Last Modified: 7/04/06 17:23
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