Stainless Steel 1.4003 (UNS S41003)

SPECIFICATIONS: GRADE 1.4003 | UNS S41003 | ASTM/ASME A240 | Werkstoff 1.4003

The Stainless Steel Grade 1.4003 can be used in many applications across a broad range of industries. There are many benefits of using type 1.4003 stainless steel as it is a cost effective weldable 12%Cr stainless steel combining:

• Strength and ductility in the as delivered and as welded condition
• Corrosion and abrasion resistance in moderately aggressive conditions
• Scaling resistance up to 600°C (1100°F)
• Good welding and fabrication properties
• Useful impact resistance

It is an attractive alternative to weathering steels, painted or galvanised steels in structural applications in natural or industrial environments.

CHEMICAL ANALYSIS

Typical values (weight %)
C	Cr	Ni	MN	N
0.015	12.2	0.5	1.0	0.03

The dual phase, low carbon composition of stainless steel 1.4003 is balanced to limit grain growth and hardening effects in the heat affected zone of welds. Stainless steel 1.4003, as opposed to older versions of low cost 12%Cr , contains no addition of titanium.

MECHANICAL PROPERTIES

Stainless steel 1.4003 is normally delivered according to EN or ASTM A240 standards up to 30mm – thicker by request.

Properties	Rp 0.2 (YS) MPa (ksi)	Rm (TS) MPa (ksi)	El. %	HB
Guarantee	≥ 280 (40)	460 – 650 (67 – 95)	> 20	< 220
Typical	400 (58)	530 (77)	23	175

It can also be delivered up to 25mm (1″) thickness in a harder condition when required.

Rp 0.2 (YS) MPa (ksi)	Rm (TS) MPa (ksi)	El. %
≥320(46,5)	460 – 650 (67 – 95)	> 18

Please consult for specific requirements.

PHYSICAL PROPERTIES

Thermal expansion:

Between (°C)	10-6 K-1	Between (°F)	10-6° F-1
20 – 100	10,5	68 – 212	5.8
20 – 200	11,0	68 – 392	6.1
20 – 300	11,5	68 – 572	6.4
20 – 400	12,0	68 – 752	6.7
20 – 500	12,2	68 – 932	6.8
20 – 600	12,5	68 – 1112	6.9

	20°C	100°C	200°C	300°C	400°C
Thermal conductivity W.m-1 . K-1	24	25	25	26	26
Specific heat J.kg-1 . K-1	460	480	500	540	620
Electrical resistivity µΩ.m	0,60	0,67	0,75	0,82	0,90
Young modulus E GPa	220	215	210	200	190
Shear modulus G GPa	85	82	80	77	72
Poisson’s ratio	0,3	0,3	0,3	0,3	0,3

Stainless steel 1.4003 is magnetic and its Curie temperature is about 740°C (1360°F).

	68°C	212°C	392°C	572°C	752°C
Thermal conductivity Btu.h-1.ft-1.°F-1	14	14,5	14,5	15	15
Specific heat Btu.lb-1.°F-1	0,11	0,115	0,12	0,13	0,15
Electrical resistivity µΩ.m	0,60	0,67	0,75	0,82	0,90
Young modulus E 106.psi	31,9	31,1	30,4	29,0	27,5
Shear modulus G 106.psi	12,3	11,9	11,6	11,2	10,4
Poisson’s ratio	0,3	0,3	0,3	0,3	0,3

Corrosion Resistance

Stainless steel 1.4003 has useful resistance in natural environments moderate corrosive conditions.

Atmospheric corrosion:

It can be used for its resistance to atmospheric corrosion where its th losses are much lower than those of weathering steels, and still ten time than for zinc or galvanised steel. It is also lower than for aluminium.

However , after a few months of service, stainless steel 1.4003 may develop a brown oxide layer which may be objectionable when cosmetic corrosion is not acceptable.

Transport systems:

The surface of stainless steel 1.4003 allows a regular flow of materials such as coal, ores, fertilisers, wood chips, cement and other granular products.

The sliding ability of stainless steel 1.4003 is maintained where structural steel surfaces lose their sliding properties because of oxidation and rust. Stainless steel 1.4003 therefore reduces clogging problems.

Water:

Stainless steel 1.4003 has a better cavitation resistance than low alloy steels and may be used to protect HSLA steels from wear and cavitation effects in hydraulic systems, such as bends or areas of turbulent flow.

However stainless steel 1.4003 is a 12%Cr steel and may be subject to localised corrosion in water environments. Check with our specialists in case of doubt, as impurities such as chlorides, fouling, microbiological activity and temperature may require higher alloyed materials.

Wet abrasion and abrasion corrosion:

In wet abrasive conditions, stainless steel 1.4003 represents an alternative when carbon steels or even abrasion resistant steels suffer from corrosive attack or loss of sliding properties. Such applications have been found in ore mining, coal mining, oil sands exploitation, slurry pipes, ash disposal in power stations and in the sugar industry. Endless screws, conveyors, hoppers, chutes, bins, screens are examples of potential areas for combined abrasion and corrosion.

High temperature and oxidation resistance:

Stainless steel 1.4003 may be used in refinery equipments to resist moderate sulphur attack, in chimneys, stacks, hot exhaust gas ducts, etc. It withstands oxidation up to 600°C (1100°F) in air or clean combustion atmospheres. The maximum service temperature limit is lower when sulphur containing impurities or chlorides are present or in reducing atmospheres.

Creep must be considered when temperature exceeds approx 450°C (800°F).

Welding

Stainless steel 1.4003 is readily weldable employing the same processes as stainless steel. The parts to be welded must be clean and free of foreign material or dirt.

Although the composition of stainless steel 1.4003 has been balanced to limit grain growth in the heat affected zones, the heat input should be limited to 2kJ/mm and interpass temperature limited to 200°C (392°F).

Stainless steel 1.4003 can be welded by SMAW, GTAW, GMAW, SAW, FCAW using filler materials type 309L, which are also used to weld stainless steel 1.4003 to carbon steel.

As for all ferritic steels, a low hydrogen practice is recommended which includes careful drying of welding fluxes and coatings, avoiding condensation on parts to be welded and protection from wet atmospheres.

No post weld heat treatment is normally required for stainless steel 1.4003. Preheating is not necessary except when welding parts at less than 5°C (40°F) where a soft preheating at 20-50°C (70°-120°F) is advisable.

APPLICATIONS

• Agriculture and forming equipment
• Transport systems, ore or coal railway cars high flow surfaces in material handling systems
• Target plates in hydropower systems
• Sugar beet processing
• Exhaust gas ducts or chimneys
• Refinery equipment
• Cement storage bins
• Sewage plant equipment
• Oil sand slurry piping
• Welded structures

Next: Stainless Steel 321 (UNS S32100)
Prev: List of Chemical Elements