1.4362 stainless steel equivalent astm

If you are searching for the 1.4362 stainless steel equivalent ASTM, the most important answer is UNS S32304 / ASTM 2304. In the U.S. standards system, 1.4362 is commonly matched with 2304 duplex stainless steel, UNS S32304. For flat products such as plate, sheet and strip, ASTM A240 is a key specification; for seamless and welded tubing, ASTM A789 is commonly used, while ASTM A790 covers seamless and welded ferritic/austenitic stainless steel pipe.

 

Why is 1.4362 called a lean duplex stainless steel?

Grade 1.4362 (also known as UNS S32304 or Alloy 2304) is called a lean duplex stainless steel because it contains a reduced proportion of costly alloying elements-specifically lower nickel and molybdenum contents-compared to standard duplex grades like 1.4462 (2205), while maintaining a balanced dual-phase microstructure.

 

What Is the ASTM Equivalent of 1.4362 Stainless Steel?

The closest ASTM/UNS designation for EN 1.4362 is ASTM 2304 / UNS S32304.The EN designation is X2CrNiN23-4, and EN 10088-2:2024 identifies it as material number 1.4362. The same grade is identified in ASTM-related specifications as 2304 / UNS S32304

Standard	Equivalent / Corresponding Grade
EN Material Number	1.4362
EN Grade	X2CrNiN23-4
UNS	S32304
ASTM Grade	2304
ASTM Plate/Sheet/Strip	ASTM A240 Type 2304 / UNS S32304
ASTM Seamless & Welded Tube	ASTM A789 UNS S32304
ASTM Seamless & Welded Pipe	ASTM A790 UNS S32304
ASME Plate/Sheet/Strip	SA-240 Type 2304
JIS Related Grade	SUS329J4L - verify specification before substitution
Material Family	Lean Duplex Stainless Steel
Microstructure	Austenitic-Ferritic Duplex

 

Chemical Composition (wt.%)

Element	Minimum (%)	Maximum (%)
Chromium (Cr)	21.50	24.50
Nickel (Ni)	3.00	5.50
Molybdenum (Mo)	0.05	0.60
Nitrogen (N)	0.05	0.20
Copper (Cu)	0.10	0.60
Carbon (C)	-	0.030
Manganese (Mn)	-	2.00
Silicon (Si)	-	1.00
Phosphorus (P)	-	0.035
Sulfur (S)	-	0.015

 

Mechanical Properties at Room Temperature

Property	Requirement
0.2% Proof Stress (Rp0.2)	≥ 400 MPa
Tensile Strength (Rm)	600–820 MPa
Elongation (A5)	≥ 25 %
Brinell Hardness	≤ 290 HBW
Impact Energy (KV at +20°C)	≥ 100 J

 

Physical and Thermal Properties

Property	Condition / Temperature	Typical Value
Density	20°C	7.8 g/cm³
Modulus of Elasticity (E)	20°C	200 GPa
Thermal Conductivity	20°C	15 W/m·K
Specific Heat Capacity	20°C	500 J/kg·K
Electrical Resistivity	20°C	0.80 Ω·mm²/m
Coefficient of Thermal Expansion	20–100°C	13.0 × 10⁻⁶ /K

 

 Corrosion Resistance and Heat Treatment

Parameter	Specification / Value
Pitting Resistance Equivalent Number (PREN)	24–28
PREN Formula	PREN = %Cr + 3.3 × %Mo + 16 × %N
Stress Corrosion Cracking (SCC) Resistance	High resistance in chloride-containing environments; generally superior to 304L and 316L
Solution Annealing Temperature	950–1050°C
Cooling Method	Rapid water quenching or air cooling, according to applicable specification and qualified processing procedure
Microstructure	Austenitic-Ferritic Duplex
Heat Treatment Condition	Solution Annealed

 

Is the corrosion resistance of 1.4362 stainless steel superior to that of 316L?

The typical PREN value for 1.4362 (2304/S32304) is approximately 26, whereas for 316L it is around 25; consequently, their overall pitting corrosion resistance may be comparable in many chloride-containing environments. However, 2304 features a duplex structure and a significantly higher yield strength-with a minimum of approximately 400 MPa-compared to the 170–240 MPa yield strength of 316L (depending on product standards). While 1.4362 may offer advantages regarding general chloride environments and stress corrosion cracking, 316L might be more suitable for certain specific chemical environments.

 

What are the differences between 1.4362  and 1.4462 stainless steels?

The primary differences lie in the molybdenum content and the resulting variations in corrosion resistance. 1.4362/2304 typically contains about 0.05%–0.60% molybdenum with a PREN value of approximately 26, whereas 1.4462/2205 contains about 2.5%–3.5% molybdenum with a PREN value of approximately 35. According to the ASTM A240 standard, the minimum yield strength of 2205 is approximately 450 MPa, which is higher than the 400 MPa of 2304. Therefore, 2205 is better suited for more aggressive chloride and chemical environments, while 2304 serves as a low-alloy, cost-effective option for applications where its corrosion resistance is sufficient to meet requirements.

 

Can EN 1.4362 replace 304L and 316L to reduce material costs?

In certain specific applications, yes; however, it should not be considered a direct, universal substitute. 1.4362 stainless steel has a chromium content of approximately 22%–24.5%, a nickel content of about 3%–5.5%, and a molybdenum content of only 0.05%–0.60%; in contrast, 316L stainless steel contains approximately 16%–18% chromium, 10%–14% nickel, and 2%–3% molybdenum. Its minimum yield strength reaches 400 MPa, allowing for the use of thinner cross-sections in certain designs. While the lower nickel and molybdenum content offers economic advantages, corrosion resistance must be taken into account when considering it as a substitute.

 

What are the applications of EN 1.4362 duplex stainless steel?

Infrastructure and Construction: Concrete reinforcement (rebar) for marine and high-chloride environments; bridge decks, tie rods, and structural frameworks.
Oil, Gas, and Water Systems: Desalination plants and water treatment systems; pump components, valves, and drive shafts; subsea and onshore pipelines.
Process and Chemical Industries: Pressure vessels and heat exchangers; storage tanks for chemicals, acids, and fertilizers.
Pulp, Paper, and Food Processing: Digesters and bleaching equipment; brewing tanks and food processing machinery.

 

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