Stainless Steel Plate

A High Carbon Version of 316 Austenitic Stainless Steel making it More Suitable for Elevated Temperature Service.

Available thicknesses for Alloy 316H:

3/8" 1/2" 5/8" 3/4" 1"
9.5mm 12.7mm 15.9mm 19mm 25.4mm
 
1 1/4" 1 1/2" 1 3/4" 2"
31.8mm 38.1mm 44.5mm 50.8mm

Specification Sheet Overview

for Alloy 316H (UNS S31609) W. Nr. 1.4401:

A High Carbon Version of 316 Austenitic Stainless Steel making it More Suitable for Elevated Temperature Service

Stainless Steel Plate

General Properties

Alloy 316H (UNS S31609) is a high carbon modification of Alloy 316 developed for use in elevated temperature service. The alloy has higher strength at elevated temperatures and is used for structural and pressure vessel applications at temperatures above 932°F (500°C). The higher carbon content of 316H also delivers higher tensile and yield strength than 316/316L and its austenitic structure provides excellent toughness down to cryogenic temperatures.

The corrosion resistance of Alloy 316H is comparable to Alloy316/316L and is superior to Alloy 304/304L in moderately corrosive environments. It is often used in process streams containing chlorides or halides. The alloy resists atmospheric corrosion, as well as, moderately oxidizing and reducing environments. It also resists corrosion in polluted marine conditions.

Alloy 316H is non-magnetic in the annealed condition. It cannot be hardened by heat treatment, however the material will harden due to cold working. It can be easily welded and processed by standard shop fabrication practices.


Applications

Standards

ASTM........A 240
ASME........SA 240

Chemical Analysis

Weight % (all values are maximum unless a range is otherwise indicated)

Element 316H 316 316L
Chromium 16.0 min.-18.0 max. 16.0 min.-18.0 max. 16.0 min.-18.0 max.
Nickel 10.0 min.-14.0 max. 10.0 min.-14.0 max. 10.0 min.-14.0 max.
Molybdenum 2.00 min.-3.00 max. 2.00 min.-3.00 max. 2.00 min.-3.00 max.
Carbon 0.04 – 0.10 0.08 0.030
Manganese 2.00 2.00 2.00
Phosphorus 0.045 0.045 0.045
Sulfur 0.030 0.030 0.030
Silicon 0.75 0.75 0.75
Nitrogen 0.10 0.10
Iron Balance Balance Balance

Physical Properties

Density

0.285 lbs/in3
8.00 g/cm3

Electrical Resistivity

74 Microhm-cm at 20°C
29.1 Microhm-in at 68°F

Melting Range

2507 – 2552°F
1375 – 1400°C

 

Specific Heat

0.11 BTU/lb-°F (32 – 212°F)
500 J/kg-°K (0 – 100°C)

Modulus of Elasticity

29.0 x 106 psi
200 GPa

Thermal Conductivity 212°F (100°C)

8.7 BTU/hr/ft2/ft/°F
15 W/m-°K
Mean Coefficient of Thermal Expansion
Temperature Range  
°F °C in/in °F cm/cm °C
68-212 20-100 8.9 x 10-6 16.0 x 10-6

Mechanical Properties

Values at 68oF (20oC) (minimum values, unless specified)

Yield Strength
.2% Offset
Ultimate Tensile
Strength
Elongation
in 2 in.
Hardness
psi (min.) (MPa) psi (min.) (MPa) %
30,000 205 75,000 515 40 95 Rockwell B

316H also has a requirement for a grain size of ASTM No. 7 or coarser.


Corrosion Resistance

In most instances the corrosion resistance of Alloy 316H will be comparable to Alloy 316/316 L and will have superior corrosion resistance to Alloy 304/304L. Process environments that do not attack Alloy 304/304L will not attack this grade. One exception, however, is in highly oxidizing acids such as nitric acid where stainless steels containing molybdenum are less resistant. Alloy 316H performs well in sulfur containing service such as that encountered in the pulp and paper industry. The alloy can be used in high concentrations at temperatures up to 120°F (38°C).

Alloy 316H also has good resistance to pitting in phosphoric and acetic acids. It performs well in boiling 20% phosphoric acid. The alloy can also be used in food and pharmaceutical process industries where it is utilized to handle hot organic and fatty acids where product contamination is a concern.

Alloy 316H performs well in fresh water service even with high levels of chlorides. The alloy has excellent resistance to corrosion in marine environments under atmospheric conditions.

The higher molybdenum content of Alloy 316H assures it will have superior pitting resistance to Alloy 304/304L in applications involving chloride solutions particularly in oxidizing environments.

Pitting Corrosion Resistance Crevice Corrosion Resistance
PRE CPT CCT
24 20±2 <0

Pitting Resistance Equivelant (PRE) is calculated using the following formula: PRE = %Cr + 3.3 x %Mo + 16 x %N
Corrosion Pitting Temperature (CPT) as measured in the Avesta Cell (ASTM G 150), in a 1M NaCl solution (35,000 ppm or mg/I chloride ions).
Critical Crevice Corrosion Temperature (CCT) is obtained by laboratory tests according to ASTM G 48 Method F.


Fabrication Data

Alloy 316H can be easily welded and processed by standard shop fabrication practices.

Hot Forming

Working temperatures of 1700 – 2200°F (927 – 1204°C) are recommended for most hot working processes. For maximum corrosion resistance, the alloy should be annealed at 1900°F (1038°C) minimum and water quenched or rapidly cooled by other means.

Cold Forming

The alloy is quite ductile and forms easily. Cold working operations will increase the strength and hardness of the alloy and might leave it slightly magnetic.

Welding

Alloy 316H can be readily welded by most standard processes. A post weld heat treatment is not necessary.

Machining

Alloy 316H is subject to work hardening during deformation and is subject to chip breaking. The best machining results are achieved with slower speeds, heavier feeds, excellent lubrication, sharp tooling and powerful rigid equipment.

Operation Tool Lubrication CONDITIONS
      Depth-mm Depth-in Feed-mm/t Feed-in/t Speed-m/min Speed-ft/min
Turning High Speed Steel Cutting Oil 6 .23 0.5 .019 11-16 36.1-52.5
Turning High Speed Steel Cutting Oil 3 .11 0.4 .016 18-23 59.1-75.5
Turning High Speed Steel Cutting Oil 1 .04 0.2 .008 25-30 82-98.4
Turning Carbide Dry or Cutting Oil 6 .23 0.5 .019 70-80 229.7-262.5
Turning Carbide Dry or Cutting Oil 3 .11 0.4 .016 85-95 278.9-312.7
Turning Carbide Dry or Cutting Oil 1 .04 0.2 .008 100-110 328.1-360.9
      Depth of cut-mm Depth of cut-in Feed-mm/t Feed-in/t Speed-m/min Speed-ft/min
Cutting High Speed Steel Cutting Oil 1.5 .06 0.03-0.05 .0012-.0020 16-21 52.5-68.9
Cutting High Speed Steel Cutting Oil 3 .11 0.04-0.06 .0016-.0024 17-22 55.8-72.2
Cutting High Speed Steel Cutting Oil 6 .23 0.05-0.07 .0020-.0027 18-23 59-75.45
      Drill ø mm Drill ø in Feed-mm/t Feed-in/t Speed-m/min Speed-ft/min
Drilling High Speed Steel Cutting Oil 1.5 .06 0.02-0.03 .0008-.0012 10-14 32.8-45.9
Drilling High Speed Steel Cutting Oil 3 .11 0.05-0.06 .0020-.0024 12-16 39.3-52.5
Drilling High Speed Steel Cutting Oil 6 .23 0.08-0.09 .0031-.0035 12-16 39.3-52.5
Drilling High Speed Steel Cutting Oil 12 .48 0.09-0.10 .0035-.0039 12-16 39.3-52.5
          Feed-mm/t Feed-in/t Speed-m/min Speed-ft/min
Milling Profiling High Speed Steel Cutting Oil     0.05-0.10 .002-.004 10-20 32.8-65.6

NOTE: The information and data in this product data sheet are accurate to the best of our knowledge and belief, but are intended for informational purposes only, and may be revised at any time without notice. Applications suggested for the materials are described only to help readers make their own evaluations and decisions, and are neither guarantees nor to be construed as express or implied warranties of suitability for these or other applications.

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