2205 Stainless Steel 1.4462（UNS32205/UNS31803）

Điều gì là 2205 stainless steel?

Duplex 2205 is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with the 300 series stainless steels. “Duplex” describes a family of stainless steels that are neither fully austenitic, like 304 stainless, nor purely ferritic, like 430 stainless. The structure of 2205 duplex stainless steel consists of austenite pools surrounded by a continuous ferrite phase. In the annealed condition, 2205 contains approximately 40-50% ferrite. Often referred to as the work horse grade, 2205 is the most widely used grade in the duplex family of stainless steels.

2205 stainless steel 1.4462 Mẫu sản phẩm

• Quầy bar
• forgings
• sheet
• plate
• pipe
• tube
• closed die forgings
• flanges and welding consumabless

Đơn đăng ký 2205 thép không gỉ

• Chemical processing, transport and storage – pressure vessels, tanks, piping, and heat exchangers
• Oil and gas exploration and processing equipment – piping, tubing, and heat exchangers
• Marine and other high chloride environments
• Effluent scrubbing systems
• Pulp and paper industry – digesters, bleaching equipment, and stock-handling systems
• Cargo tanks for ships and trucks
• Thiết bị chế biến thực phẩm
• Biofuels plants

Equivalents of grade 2205

Lớp	UNS Không	Tiếng Anh cổ		Tiêu chuẩn châu Âu		SwedishSS	Tiếng NhậtJIS
		BS	Vào	Không	Tên
2205	S31803 / S32205	318S13	–	1.4462	X2CrNiMoN22-5-3	2377	SUS 329J3

Thành phần ranges for 2205 grade of stainless steel

	C	Mn	Si	P	S	Cr	Thứ Hai	Ni	N
2205 (S31803)	0.03 max	2.0 max	1.0 max	0.03 max	0.02 max	min: 21.0 max: 23.0	min: 2.5 max: 3.5	min: 4.5 max: 6.5	min: 0.08 max: 0.20
2205 (S32205)	0.03 max	2.0 max	1.0 max	0.03 max	0.02 max	min: 22.0 max: 23.0	min: 3.0 max: 3.5	min: 4.5 max: 6.5	min: 0.14 max: 0.20

Tính chất cơ học

Lớp	Tensile Str (MPa) min	Giới hạn chảy 0.2% Proof (MPa) min	Độ giãn dài (% in 50mm) min	Độ cứng
				Rockwell C (HR C)	Brinell (HB)
2205	621	448	25	31 max	293 max

Tính chất vật lý

Lớp	Mật độ (kg/m3)	Elastic Modulus(GPa)	Mean Co-eff of Thermal Expansion (μm/m/°C)			Thermal Conductivity (W/m.K)		Specific Nhiệt 0-100°C( J/kg.K)	Electrical Resistivity (nΩ.m)
			0–100°C	0–315°C	0–538°C	ở 100°C	ở nhiệt độ 500°C
2205	7800	190	13.7	14.2	–	19	–	418	850

Khả năng chống ăn mòn

2205 duplex stainless steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.

The combination of chromium, molybdenum and nitrogen convey the good resistance of 2205 to chloride pitting and crevice corrosion. This resistance is extremely important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications. The high chromium, molybdenum and nitrogen contents of 2205 provide corrosion resistance superior to common stainless steels, such as, 316L and 317L in most environments.

Khả năng chịu nhiệt

2205 Duplex Stainless Steel is remarkable for its superior heat resistance; it can be used in applications involving temperatures up to 300°C. This makes it a perfect choice for uses such as steam turbine parts, exhaust manifolds and petrochemical processing equipment. Its heat resistance is achieved through the balanced chemical composition of chromium, molybdenum, nitrogen and other elements. It also has a high tensile strength and good weldability, so its durability speaks for itself. Making 2205 Duplex Stainless Steel the right material solution for many critical components.

Xử lý nhiệt

2205 duplex stainless steel should be annealed at 1900°F minimum, followed by rapid cooling, ideally by water quenching. This treatment applies to both solution annealing and stress relieving. Stress relief treatments at any lower temperature carry the risk of precipitation of detrimental intermetallic or nonmetallic phases.

Gia công nóng

Forming below 600°F is recommended whenever possible. When hot forming is required, the workpiece should be heated uniformly and worked in the range of 1750 to 2250°F. 2205 duplex stainless steel is quite soft at these temperatures and is readily formed. Above this range, 2205 duplex stainless steel is subject to hot tearing. Immediately below this range, the austenite becomes substantially stronger than the ferrite and may cause cracking, a particular danger to “cold” edges. Below 1700°F there can be rapid formation of intermetallic phases because of the combination of temperature and deformation. Whenever hot forming is done, it should be followed by a full solution anneal at 1900°F minimum and rapid quench to restore phase balance, toughness, and corrosion resistance. Stress relieving is not required or recommended; however, if it must be performed, the material should receive a full solution anneal at 1900°F minimum, followed by rapid cooling or water quenching.

Gia công nguội

Duplex 2205 has shown good formability in a variety of fabrications. The high strength of Duplex 2205 can pose problems. Even when the equipment has sufficient power, allowance must be made for higher spring-back caused by the grade’s high strength.

Khả năng gia công:

Thép Duplex 2205 khó gia công hơn một chút so với các loại thép không gỉ austenit thuộc dòng 300. Quá trình gia công đòi hỏi lực cắt lớn hơn và thường dẫn đến hiện tượng mòn dao cụ nhanh hơn. Một số hướng dẫn gia công bao gồm: A) Sử dụng máy móc mạnh mẽ, cứng cáp với hệ thống cố định dao cụ và phôi cực kỳ chắc chắn, B) Giảm thiểu rung động bằng cách giữ chiều dài dao cụ ngắn nhất có thể, C) Sử dụng bán kính mũi dao trên dao cụ, không dài hơn mức cần thiết, đối với các loại carbide có cạnh sắc nhưng vẫn đảm bảo độ cứng đủ, D) Thiết kế trình tự gia công sao cho độ sâu cắt luôn nằm dưới lớp cứng do các lần gia công trước đó tạo ra.

Hàn

2205 steel is easily weldable by the common methods but it should not be welded in the absence of filler metal because it may produce ferrite phases. Since 1554.6 metal qualifies the welding of stainless steel 2205 alloy with the help of 2209 rods or electrodes that make sure that the metal has been deposited equally. The nitrogen is included as the shielding material to support in guarantee the sufficient austenite in the shape.

Key Advantages of 2205 Duplex Stainless Steel

2205 Duplex Stainless Steel provides several advantages that make it an excellent choice for varied applications. One of its major benefits is its superior corrosion resistance. This is crucial in chloride-rich environments where conventional metals might fail.

In addition to corrosion resistance, 2205 offers enhanced mechanical strength. Its higher yield strength compared to austenitic stainless steels allows for thinner material usage. This translates into weight savings and potentially lower costs.

Other notable advantages include:

• Cost-Effectiveness: Reduced nickel content.
• Weldability: Efficient when proper methods are applied.
• Environmental Suitability: Excellent in marine and industrial settings.

2205 vs 316 Stainless Steel: A Comparison

Choosing between 2205 and 316 stainless steel depends on application needs. Each offers unique benefits suited to different environments and uses.

2205 excels in high-stress situations with better corrosion resistance in harsh conditions. In contrast, 316 is often chosen for its ease of fabrication and availability.

Key differences include:

• Corrosion Resistance: 2205 is superior.
• Strength: 2205 has higher yield strength.
• Ease of Fabrication: 316 is easier to work with.

Kết luận

2205 Stainless Steel stands out for its strength and durability. Its unique composition offers significant advantages across various industries. Whether in harsh chemical environments or marine settings, duplex stainless steel 2205 is a reliable choice for demanding applications.