EN 1.4432, ASTM TYPE 316L Stainless Steel

EN 1.4432, ASTM TYPE 316L Stainless Steel

EN 1.4432, ASTM TYPE 316L Stainless Steel General Characteristics 316L/4432 has high resistance to non-oxidizing acids and chloride-containing media due to its higher molybdenum content. 316L/4432 has good formability and weldability. 316L/4432 is an austenitic stainless steel that belongs to...
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EN 1.4432, ASTM TYPE 316L Stainless Steel

General Characteristics

316L/4432 has high resistance to non-oxidizing acids and chloride-containing media due to its higher molybdenum content. 316L/4432 has good formability and weldability.


316L/4432 is an austenitic stainless steel that belongs to the standard CrNiMo stainless steel family. It has low carbon content for improved resistance against intergranular corrosion after welding and increased molybdenum content for slightly improved corrosion resistance.


Due to their molybdenum content, the austenitic CrNiMo standard grades can be used in applications with increased demand for corrosion resistance. Their well-balanced material properties make them suitable for the fabrication of many products.


Typical Applications

Drinking water systems

Cooling systems

Wastewater systems

Flanges and valves


Product forms, available sizes and finishes

Flat

Product typeFinishesThicknessWidth
Black hot band

1U

2,70-8,50

1000-1650

Cold rolled coil

2B, 2BB, 2C, 2D, 2E, 2G, 2H, 2J, 2K, 2M, 2R

0,05-6,35

3-2050

Cold rolled sheet

2B, 2BB, 2D, 2E, 2G, 2J, 2K, 2R

0,30-6,35

35-2050

Hot rolled coil, pickled

1C, 1D, 1E, 1G, 1M, 1U

1,46-12,70

50-2050

Precision strip

2R

0,05-1,50

3-649

Quarto plate

1D

5,00-130,00

400-3200


Long

Product typeThicknessWidth

Bloom

395,00-405,00

295-305

Cast slab

165,00-305,00

1000-1585

Forged billet round

200,00-230,00

200-230

Forged billet square

200,00-230,00

200-230

Hot rolled / Black bar round

75,00-230,00

75-230

Peeled / turned bar round

70,00-170,00

70-170

Rolled billet round

90,00-200,00

90-200

Rolled billet square

75,00-200,00

75-200

Wire rod (Rod coil) hex

9,00-27,00

9-27

Wire rod (Rod coil) round

5,00-27,00

5-27

Wire rod (Rod coil) square

9,00-24,00

9-24


Chemical Composition

The typical chemical composition for this grade is given in the table below, together with composition limits given for the product according to different standards. The required standard will be fully met as specified on the order.


The chemical composition is given as % by mass.


CMnCrNiMoN
Typical

0.02


16.9

10.7

2.6


ASME II A SA-240

≤0.08

≤2.00

16.0-18.0

10.0-14.0

2.00-3.00

≤0.10

EN 10028-7

≤0.030

≤2.00

16.5-18.5

10.5-13.0

2.50-3.00

≤0.10

EN 10088-2

≤0.030

≤2.0

16.5-18.5

10.5-13.0

2.5-3.0

≤0.10

EN 10088-3

≤0.030

≤2.00

16.5-18.5

10.5-13.0

2.50-3.00

≤0.10

EN 10088-3

≤0.030

≤2.00

17.0-19.0

12.5-15.0

2.50-3.00

≤0.10

EN 10088-4

≤0.030

≤2.0

16.5-18.5

10.5-13.0

2.5-3.0

≤0.10


Mechanical Properties

The mechanical properties of the available products in the soft annealed condition at room temperature are given in the table below. Moderate strengths can be reached at elevated temperatures (~550 °C/1022 °F). Temperatures for excessive scaling are close to 850 °C/1562 °F.


This grade, along with other austenitic corrosion-resistant steels, exhibits very high ductility and high elongation to fracture. It is not susceptible to brittle fracture in the solution annealed condition.


StandardRp0.2Rp1.0RmElongationRockwellHB

MPa

MPa

MPa

%



Product type: Cold rolled coil and sheet

Typical (thickness 1 mm)

300

330

620

70



ASME II A SA-240

≥ 205


≥ 515



≤ 217

EN 10028-7

≥ 240

≥ 270

550-700

≥ 40



EN 10088-2

≥ 240

≥ 270

550-700

≥ 40



EN 10088-4

≥ 240

≥ 270

550-700

≥ 40



Product type: Hot rolled coil and sheet

Typical (thickness 4 mm)

315

360

615

50


165

ASME II A SA-240

≥ 205


≥ 515



≤ 217

EN 10028-7

≥ 240

≥ 270

550-700

≥ 40



EN 10088-2

≥ 240

≥ 270

550-700

≥ 40



EN 10088-4

≥ 240

≥ 270

550-700

≥ 40



Product type: Hot rolled quarto plate

Typical (thickness 15 mm)

260

280

570

50



ASME II A SA-240

≥ 205


≥ 515


≤ 95HRB

≤ 217

EN 10028-7

≥ 220

≥ 260

520-670

≥ 45



EN 10088-2

≥ 220

≥ 260

520-670

≥ 45



EN 10088-4

≥ 220

≥ 260

520-670

≥ 45



Product type: Wire rod

Typical

220

260

530

55




Physical Properties

According to EN 10088 are shown below.

DensityModulus of elasticityThermal exp. at 100 °CThermal conductivityThermal capacityElectrical resistanceMagnetizable

kg/dm3

GPa

10-6/°C

W/m°C

J/kg°C

µΩm


8.0

200

16,0

15

500

0.75

No


Standards & Approvals

The most commonly used international product standards are given in the table below.

StandardDesignation
EN 10028-7, PED 2014/68/EU

1.4432

EN 10088-2

1.4432

EN 10088-3

1.4432; 1.4435

EN 10088-4

1.4432


Welding

316L/4432 has excellent weldability and is suitable for the full range of conventional welding methods (like MMA, MIG, MAG, TIG, SAW, LBW, or RSW), except gas welding.


316L/4432 has about 50% higher thermal expansion and lower heat conductivity compared to carbon steels. This means that larger deformation and higher shrinkage stresses may result from welding.


In thin sections, autogenous welding may be used. To ensure that the weld metal properties (e.g. strength, corrosion resistance) are equivalent to those of the parent metal, matching or slightly over-alloyed fillers should preferably be used. The recommended filler metal is 19 12 3L.


Post-weld heat treatment is generally not required. In special cases with high risks of stress corrosion cracking or fatigue, stress relief treatment may be considered. In order to fully restore the corrosion resistance of the weld seam, the weld discoloration should be removed by pickling and passivation.


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