headerdrawing1.jpg (96365 bytes)

Sulphuric Acid on the WebTM Technical Manual DKL Engineering, Inc.

Knowledge for the Sulphuric Acid Industry Line.jpg (1139 bytes)

Sulphuric Acid on the Web

Introduction
General
Equipment Suppliers
Contractor

Instrumentation
Industry News
Maintenance
Acid Traders
Organizations
Fabricators
Conferences

Used Plants
Intellectual Propoerty
Acid Plant Database
Market Information
Library

Technical Manual

Introduction
General

Definitions
Instrumentation
Plant Safety
Metallurgial Processes
Metallurgical
Sulphur Burning
Acid Regeneration
Lead Chamber
Technology
Gas Cleaning
Contact
Strong Acid
Acid Storage
Loading/Unloading

Transportation
Sulphur Systems
Liquid SO2
Boiler Feed Water
Steam Systems

Cooling Water
Effluent Treatment
Utilities
Construction
Maintenance
Inspection
Analytical Procedures
Materials of Construction
Corrosion
Properties
Vendor Data

DKL Engineering, Inc.

Handbook of Sulphuric Acid Manufacturing
Order Form
Preface
Contents
Feedback

Sulphuric Acid Decolourization
Order Form
Preface
Table of Contents

Process Engineering Data Sheets - PEDS
Order Form
Table of Contents

Introduction

Bibliography of Sulphuric Acid Technology
Order Form

Preface
Contents

Sulphuric Acid Plant Specifications
 

Google Search new2.gif (111 bytes)

 

 


Materials of Construction - Metals - Hastelloy C-2000
April 22, 2004

Introduction
Chemical Composition
Corrosion Resistance
Designation
Specifications
Physical Properties
Mechanical Properties

Fabrication
        Heat Treatment
        Forming
        Welding
Associated Links

Alloy C-276

Introduction

Hastelloy C-2000 alloy (UNS N06200) is a nickel-molybdenum-chromium wrought alloy to which copper has been added.  This alloy was first introduced in 1995 and has since gained increasing popularity owing to its inherent versatility.  C-2000 alloy was designed to resist an extensive range of corrosive chemicals including sulphuric, hydrochloric and hydrofluoric acids.  However, unlike other Ni-Cr-Mo alloys which were corrosion resistant to either oxidizing or reducing acids, but not both, C-2000 alloy was designed to be used in both environments.  The combination of molybdenum and copper provide resistance to reducing media while the high chromium content provided resistance to oxidizing media.

In sulphuric acid plant applications, C-2000 alloy has been used interchangeably with Alloy C-276 for plate and frame heat exchanger plate by some vendors.

Back to top

Chemical Composition (%)

    C-2000 Alloy C-276
Nickel Ni Balance Balance
Cobalt Co   2.5 max
Chromium Cr 23 14.5 - 16.5
Molybdenum Mo 16 15.0 - 17.0
Tungsten W   3.0 - 4.5
Carbon C 0.01 max 0.01 max
Iron Fe   4.0 - 7.0
Silicon Si 0.08 max 0.08 max
Manganese Mn   1.0 max
Vanadium V   0.35 max
Phosphorous P   0.025 max
Sulphur S   0.010 max
Copper Cu 1.6 -

Back to top

Corrosion Resistance

To follow

Designations

UNS N06200

Back to top

Specifications

ASTM Specifications B564, B574, B575, B619, B626, B366

ASME Code Case 2240

DIN Specifications 17744 No. 2.4675 and NiCr23Mo16Cu

Back to top

Physical Properties

Density 8500 kg/m³ (530.5 lb/ft³) @ Room Temp.
Melting Point  
Specific Heat
Electrical Resistivity 1.28 microhm m (50.6 microhm in) @ Room Temp.
Thermal Conductivity 9.1 W/m K (63 BTU in/ft² h ºF) @ Room Temp.
10.8 W/m K (74 BTU in/ft² h ºF) @ 93ºC (200ºF)
14.1 W/m K (99 BTU in/ft² h ºF) @ 315ºC (600ºF)
18.0 W/m K (133 BTU in/ft² h ºF) @ 538ºC (1000ºF)

Back to top

Mechanical Properties

Thickness

Temperature Ultimate Tensile Strength Yield Strength @ 0.2% offset Elongation in 50.8 mm (2 inches)
0.063 in. Room Temp 752 MPa (109.0 ksi) 358 MPa (52.0 ksi) 64%
0.125 in. Room Temp 765 MPa (111.0 ksi) 393 MPa (57.0 ksi) 63%
0.250 in. Room Temp 779 MPa (113.0 ksi) 379 MPa (55.0 ksi) 62%
0.500 in. Room Temp 758 MPa (110.0 ksi) 345 MPa (50.0 ksi) 68%
1.00 in. Room Temp 752 MPa (109.0 ksi) 372 MPa (54.0 ksi) 63%

Back to top

Fabrication

Heat Treatment

No information

Back to top

Forming

No information

Back to top

Welding

C-2000 Alloy is weldable by shielded-metal arc, gas-tungsten arc and gas-metal arc.  Oxy-acetylene and submerged-arc welding are not recommended.

The Ni-Cr-Mo alloys exhibit low penetration characteristics, therefore adequate joint access (weld angle) and minimal land are suggested.

The interpass temperature should be held below 93ºC (200ºF) and excessive heating should be avoided, especially on thin parts.

The weld metal is viscous (sluggish) and therefore some torch manipulation is usually necessary.  Increasing the current (amperage) will not substantially increase the fluidity of the weld puddle.

Post weld stress relieving at approximately 650ºC (1202ºF) is inappropriate for the Ni-Cr-Mo alloys.  Normally a post-weld heat treatment is not necessary, but if stresses must be relieved, a full solution anneal at 1149ºC (2100ºF) is recommended, followed by water quenching.

Back to top