DDI "Rectangular, Square , Cube" ^TM

^{Don't Waste the Waste: Use DDI Heat Recovery}

^{Since 1980}

1. DDI Pre-Heating of RAW Sludge
2. DDI Heating of Digester Sludge
3. DDI Heat-Recovery from digested sludge
4. DDI Cooling of Digested Sludge
5. DDI Heat Exchanger Guide
6. SS316 compared to Carbon Steel

General Information
Spec #1
Spec #2
Spec #3
Computerized Data Acquisition
Spec #4

Mr. Schwartz:
ASME SA-516 Gr 70
Cheneistry:


Mechanical Properties:
Tensile Strength = 70/90 Ksi
Yield Strength = 38 Ksi
Elongation in 8" = 17%
Elongation in 2" = 21%
Typical Rockwell hardness prior to any hardening = 85 HRB (163 Brinell), could reach 45HRC (430 Brinell)

recommendations:
ASME SA-516 Gr 70 Vs. 316L St. Steel
516-70 have higher yield strength than 316L (38Ksi to 34Ksi)
516-70 have lower elongation percentage (Higher Toughness) than 316L (21% to 55%)
516-70 will always yield to a higher hardness and toughness due to Cr, Mo, and V carbides when annealed.

Kameel Al-Ejel
Rockwell Automation
Chief Engineer/Plant Metallurgist
Rogersville, Tennessee
(423) 272-1282 Phone
(423) 272-1313 Fax

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Copyright © 2004 DDI-Heat Exchangers Inc.
Last modified: 02/19/08