440B pipe stainless

440B stainless steel Name: Martensitic stainless steel Standard: AISI, ASTM Model: 440B UNS number: S44003 ●440B characteristics and applications: 440B stainless steel has higher hardness than 440A steel and higher toughness than 440C steel. 440B stainless steel is used in cutting tools, measuring tools, bearings, valves, etc. Suitable for bayonet blades. ●440B①Chemical composition: Carbon C: 0.75~0.95 Manganese Mn: ≤1.00 Silicon Si: ≤1.00 Chromium Cr: 16.0~18.0 Nickel Ni②: - Phosphorus P: ≤0.04 Sulfur S: ≤0.03 Molybdenum Mo: ≤0.75 Note: ① Unless Otherwise stated, the single value is the highest value; ② When used in certain pipe making processes, the nickel content of some models of austenitic stainless steel must be slightly higher than the value shown in the table; ③ Optional; ④ The maximum Ta content is 0.10%; ⑤ The maximum Ta content is 0.75%; ⑥ The maximum Ta content is 0.70%

Stainless steel is a high-alloy steel that has good corrosion resistance due to the large amount of chromium it contains. Most stainless steel contains about 10% chromium.

Stainless steel can be divided into three categories based on crystal structure. These groups include martensite, austenite and ferrite. The combination of martensitic and ferritic steels forms the fourth group of stainless steels, called precipitation-hardened steels.

Grade 440B stainless steel is a high carbon martensitic stainless steel with good strength, moderate corrosion resistance and the ability to obtain and maintain wear resistance and excellent resistance.

The following datasheet provides an overview of Grade 440B stainless steel.

Chemical Composition

The chemical composition of grade 440B stainless steel is outlined in the following table.

Element	Content (%)
Iron, Fe	80
Chromium, Cr	16.0-18.0
Manganese, Mn	1.0
Silicon, Si	1.0
Carbon, C	0.75-0.95
Molybdenum, Mo	0.75
Phosphorous, P	0.040
Sulfur, S	0.030

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welding
Welding of grade 440B stainless steel is generally not recommended because it hardens easily in air. If welding this steel grade, the recommended temperature is 260°C (500°F), and for post-weld treatment, the recommended temperature is 732-760°C (1350-1400°F). Post-weld treatment should be carried out for 6 hours, and then the material should be cooled slowly in the furnace to avoid cracking. Similar high heat input and filler metal should be used during operation.

Machinability
Grade 440B stainless steel is best machined in the annealed condition. Chipbreakers are designed to handle tough, sticky chips in grade 440B stainless steel. Ceramic or carbide tools are best suited for this grade 440B stainless steel.

Thermal processing
Hot working of Grade 440B stainless steel involves preheating the steel to 760°C (1400°F) and then slowly increasing the temperature range to 1038-1204°C (1900-2200°F). After the thermal working process, the material is slowly cooled to room temperature and then completely annealed.

application

Cutting tools, knives, blades, cutlery, guide rails, wear parts, perforated discs, screw elements, pump shafts, weighing pans, horizontal cutting, surgical instruments, plastic moulds, injection nozzles, roller bearings, ball bearings, mechanical engineering, food industry , construction industry

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