Alloy 2304 Duplex Stainless Steel Plate S32304 Steel Plate

• Type: Stainless Steel Sheets
• Standard: ASTM, AISI
• Grade: Duplex Steel
• Certification: ISO, AISI
• Shape: Flat
• Technique: Hot Rolled
• Model NO.: 2304 s32304
• Surface Treatment: Pickling
• Transport Package: Wooden Pallet Wooden Box
• Specification: 1220*2440, 1500*3000, 1500*6000, 2000*6000mm
• Origin: China
• HS Code: 7219340000
• Production Capacity: 50000kgs

Product Description

Alloy 2304 (UNS S32304) is a 23% chromium, 4% nickel, molybdenum-free duplex stainless steel. The Alloy 2304 has corrosion resistance properties similar to 316L. Furthermore, its mechanical properties, i.e., yield strength, are twice those of 304L/316L austenitic grades. This allows the designer to save weight, particularly for properly designed pressure vessel applications.

Chemical Analysis

Typical Values (Weight %)

Carbon	Chromium	Nickel	Molybdenum	Nitrogen	Others
0.020	23	4	0.2	0.1	S=0.001
PREN = [Cr%] = 3.3 [Mo%] = 16 [N%] ≥ 24

Mechanical Properties

Tensile Properties (Minimum Values)

°C	Rp 0.2 MPa	Rp 1.0 MPa	Rp 1.0 MPa	°F	YS 0.2% Offset KSI	YS 0.1% Offset KSI	UTS KSI	Elongation %
20	400	440	600	68	58	64	87	25
100	330	365	570	212	48	53	83	25
200	280	310	530	392	41	45	77	20
300	230	260	490	572	33	38	71	20

Values obtained for hot rolled plates (th ≤ 2"). Alloy 2304 must not be used for a long time at temperatures higher than 300°C (572°F), where precipitation hardening phenomenon occurs.

Toughness Values (KCV Minimum Values)

Temp.	-50°C	+20°C	-60°F	+70°F
Single	75 J/cm_	90 J/cm_	54 ft. lbs	65 ft. lbs
Average (5)	90 J/cm_	150 J/cm	65 ft. lbs	87 ft. lbs

Hardness (Typical Values)

Average (5)

HV10 180-230

HB : 180-230

HRC _ 20

Physical Properties

Density : 7,800 kg/m³ - 0.28 lb/in³

Interval Temper °C	Thermal expansion ax10M^-bK^-1	°C	Resistivity (μ_ cm)	Thermal conductivity (W.m^-1.K^-1)	Specific heat (J.kg^-1.K^-1	Young modulus E (GPa)	Shear modulus G (GPa)
20-100	13	20	80	17	450	200	75
20-100	13	100	92	18	500	190	73
20-200	13.5	200	100	19	530	180	70
20-300	14	300	105	20	560	170	67

Structure

The chemical analysis of 2304 is optimized to obtain a typical 50 a / 50 g microstructure after solution annealing treatment at 950°/1050°C (1742°/1922°F).

The microstructure of 2304 duplex is very stable compared to molybdenum-containing duplex stainless steels. Intermetallic phases are present only after 10 hours holding time in the 750°/850°C (1382°/1562°F) temperature range. Copper additions to 2304 grade, when specified, increase the hardness of the steel after heat treatment in the 350°/500°C (662°/932°F) temperature range.

Processing

Hot Forming

Hot forming must be performed in the 1150/900°C (2100/1650°F) temperature range. After forming, a new solution annealing treatment is recommended in the 950°/1050°C (2100°/1650°F) temperature range to fully restore corrosion resistance properties and mechanical properties. Parts formed with 2304 must be supported carefully during heating to avoid creep deformation.

Cold Forming

Alloy 2304 may be cold formed without any problem. The same equipment as used for the cold forming of 304L and 316L grades can be used. Due to its higher mechanical properties, including the yield strength, higher stresses are required for cold forming. A final solution annealing heat treatment is also recommended after cold forming in order to restore the mechanical and corrosion resistance properties, as decribed in 'hot forming.'

Descaling

Use the same solutions and pastes as for Alloys 304L/316L. The pickling time will be higher than for austenitic grades due to the corrosion resistance properties of the alloy.

Machinability

Alloy 2304 duplex exhibits improved machinability properties particularly when considering drilling. Its behavior is equivalent to that of 316LEZ*. Furthermore, 2304 has better corrosion resistance and cleanliness properties as no sulphur additions are necessary. Localized corrosion resistance behavior is improved.