What is the impact value of S32750 base metal 5

The national standard GB T 20878-2007 stipulates that the tensile strength of S32750 is greater than 795MPa and the yield is greater than 550MPa, and the high limit is not specified. So these two properties are qualified.

However, the standard stipulates that the extension is not less than 15%, and the hardness is not higher than HB310. In the case of such high tensile strength and yield strength values, the elongation and hardness performance data may not meet the standard, please judge whether the material is qualified by the elongation and hardness values of the actual test.

The main representative grades of duplex stainless steel.

It can generally be divided into four categories.

Low alloy type - representative grade: UNS S32304 (

Medium alloy type - representative grade: UNS S31803 (

High alloy type - representative grade: UNS S32550 (

Super Duplex Stainless Steel Type - Standard Grade: UNS S32750 (

The low-alloy type UNS S32304 does not contain molybdenum and can be used in place of AISI304 or 316 in terms of stress corrosion resistance.

Medium alloy type: The corrosion resistance of UNS S31803 is between AISI316L and 6% Mo+N austenitic stainless steel.

High alloy type: generally contains 25% Cr, but also contains molybdenum nitrogen, some also contain copper wall and tungsten, the corrosion resistance of this kind of steel is higher than 22% Cr duplex stainless steel.

Super duplex stainless steel type: containing high molybdenum and nitrogen, some also contain tungsten and copper, also suitable for harsh media conditions, with good corrosion resistance and mechanical comprehensive properties, comparable with super austenitic stainless steel.

S31803 is a duplex stainless steel with twice the strength of austenitic stainless steel.

Chemical Composition: C Mn Si P s Cr NiShanghai Xiangqia metal team, looking forward to your consultation!

Duplex stainless steel composed of 21% chromium, molybdenum and nickel-nitrogen alloys. It has high strength, good impact toughness, and good overall and local resistance to stress corrosion. Duplex stainless steels have twice the yield strength of austenitic stainless steels, a feature that allows designers to reduce weight when designing products, giving this alloy an advantage over 316,317L.

This alloy is particularly suitable for temperatures ranging from -50°F to +600°F. This alloy can also be considered for applications beyond this temperature range, but there are some limitations, especially when applied to welded structures.

Duplex stainless steel has twice the compressive strength compared to austenitic stainless steel, and designers can reduce its weight compared to 316L and 317L. Alloy 2205 is particularly suitable for the -50°F +600°F temperature range and can also be used at lower temperatures in tightly restricted situations, especially for welded structures.

Applications:

Pressure vessels, high-pressure storage tanks, high-pressure pipes, heat exchangers (chemical processing industry).

Oil and gas pipelines, heat exchanger fittings.

Sewage treatment system.

Pulp and paper industry sorters, bleaching equipment, storage and handling systems.

Rotary shafts, press rolls, blades, impellers, etc. in high-strength and corrosion-resistant environments.

Cargo boxes for ships or trucks.

Food processing equipment.

General steel ** businessmen can provide it!

S32750 corresponds to 2507, and S31803 corresponds to 2205, which are relatively common materials.

The impact value data of 316L below -196 degrees is based on the side expansion data, and the American standard only requires side expansion, and the general base metal weld.

Mechanical properties of this section.

Tensile Strength b (MPa): 480 Conditional Yield Strength MPa): 177 Elongation δ5 (%40 Section Shrinkage 60 Hardness:

187hb;≤90hrb;200HV Hardness 187HB 90HRB 200HV Density:; Specific heat capacity ratio (20):

If it is a low-temperature material, the design temperature is low-temperature, it is natural to do low-temperature impact, otherwise the impact at room temperature will not reflect whether your process evaluation is suitable for low-temperature conditions.

This completely depends on the requirements of the welded base metal, the performance of the wood requires how many degrees of impact, you do how many degrees of impact, the impact value is not lower than the specified value of the base metal, and it is qualified, because the welding requirement is that the performance of the weld is not lower than that of the base metal.

Generally, the design is done on the basis of the standard, and the design requirements may be difficult to standard, and it must be verified by design.

Downstairs said that part of it is right, and some of it depends on the requirements of product drawings.

S32750 is 2507 duplex stainless steel plate** is about 48,000 yuan ton, and Bowen 904L is super austenitic stainless steel plate** about 68,000 yuan ton.

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Just look at the chemical composition to know which one is more expensive... 904 is a super austenitic stainless steel with a Ni content of about 25%; S32750 is a super duplex steel with a Ni content of only about 7%... The Ni element is the most basic element to measure stainless steel**.

It must be 904L expensive.

32750-2507 in China, only 7 NI, how expensive can it be 904L-25 NI, 4 MO

The latter is 18 nickels more than the former, which is of course much more expensive.

Of course, the former has a lower yield than the latter, so no matter how expensive the cost of steelmaking is, it is also high, but the cost of raw materials is used in chemical anti-corrosion equipment such as desulfurization and denitrification.

The 904L focuses on comprehensive performance.

2507 is more durable and wear-resistant, and is more sensitive to temperature and not resistant to high temperatures.

The 904L is more expensive The 904L are all over 100 more than a kilogram.

1. Grade: 904L austenitic stainless steel.

Two: Chemical composition:

Carbon C: Manganese Mn: Silicon Si: Chromium Cr: Nickel Ni:

Phosphorus P: Sulfur S: Molybdenum Mo: Copper Cu:

Three: Scope of applicationApplication field: perennial spot inventory round bar, plate, seamless pipe, tape and reel!

Petroleum and petrochemical equipment, such as reactors in petrochemical equipment, sulfuric acid storage and transportation equipment, such as heat exchangers, etc., flue gas desulfurization devices in power plants, the main parts of use are: tower body, flue, door panel, internal parts, spray system, etc., scrubbers and fans in organic acid treatment systems, seawater treatment devices, seawater heat exchangers, paper industry equipment, sulfuric acid, nitric acid equipment, acid production, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment, pharmaceutical factories: centrifuges, reactors, etc., Plant Food:

Soy sauce tanks, cooking wine, salt tanks, equipment and dressings, against dilute sulfuric acid strong corrosive medium 904L is a matching steel grade.

Four: Physical properties:

Density:. Tensile strength: b 520mpa. Elongation: δ 35%.

Five: Overview. This steel thermoforming can be carried out at 1000-1150 degrees Celsius. The heat treatment process of the steel is 1100-1150 degrees Celsius, and it is quickly cooled after heating. Although this steel can be welded using a common welding process, the appropriate welding methods are manual arc welding and tungsten argon arc welding.

When manual arc welding is used to weld plates not more than 6 mm, the diameter of the electrode is not more than mm; When the plate thickness is greater than 6 mm, the diameter of the electrode is less than mm. When heat treatment is required after welding, it can be heated at 1075-1125 degrees Celsius and then cooled quickly. The filler metal used for tungsten argon arc welding can be used with the same material electrode, and the weld must be pickled and passivated after welding.