316Lmod 1.4435 725LN 310MoLN stainless steel round bar

1.316L mod is modified 316L, which is the American AIS I standard grade, urea grade ultra-low carbon stainless steel. It is an improved 316L, austenitic-ferritic duplex stainless steel, specially used in the urea industry, so it is called urea grade 316L.

Because of its excellent resistance to welding hot cracks and resistance to intergranular corrosion, it is often used as a high-pressure pipeline material for petrochemical urea plants.

2. Main features

It has excellent resistance to welding hot cracks and resistance to intergranular corrosion.

3. Typical chemical composition (mass fraction, %)

C carbon: ≤0.030

Cr chromium: 17.0~18.5

Ni Nickel: 13.0~15.0

Manganese Mn: ≤2.0

Mo molybdenum: 2.0~3.0

Si silicon: ≤1.0

S sulfur: ≤0.22

P phosphorus: ≤0.045

N nitrogen: 0.19

Mechanical properties:

Tensile strength: σb≥520Mpa.

Elongation: δ≥45%.

Physical properties:

Density: 7.90g/cm3

Examples of uses: used in petrochemical, hydropower, nuclear power, marine oil and gas, aerospace and military industry, machinery manufacturing, food equipment, construction and installation industries.

Varieties and specifications: forgings, bars, plates, strips, rings, wires, bolts, springs, etc.

The difference between 316Lmod and 316L

316L mod is modified 316L, modified 316L, specially used in the urea industry, so it is called urea grade 316L. The main difference from 316L is the chemical composition.

The main difference with 316L is the chemical composition. There are additional restrictions on the minimum content of Cr, Ni, and Mo. The purpose of adjusting the composition is to fully suppress the ferrite content in the steel and obtain the full austenite structure as much as possible to improve the intergranular corrosion and selective corrosion resistance of the steel. . Urea grade stainless steel needs to be subjected to Hough test and selective corrosion test. The test conditions are very harsh, and it is difficult for ordinary stainless steel to pass.

The chemical composition of 316mod and 316L is not very different. 316mod must pass the Huey test. During the 48-hour boiling corrosion test period, the corrosion value of 5 samples shall not be less than 0.54gr/m2hr (3.3 microns/48 hours) ).

The chemical composition of 316mod and 316L is not very different. 316mod must pass the Huey test. During the 48-hour boiling corrosion test period, the corrosion value of 5 samples shall not be less than 0.54gr/m2hr (3.3 microns/48 hours) ).