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High Performance Stainless Steels

SHEFFIELD™ MDSS – (2101 Duplex) – Lean Duplex Stainless TGP Shafting

Sheffield MDSS is a Lean-Duplex Stainless grade that outperforms most austenitic grades in a host of critical service applications.

In general, Duplex Stainless Steels provide benefits that relate directly to the structure, which displays equal amounts of Austenite and Ferrite.

Austenitic grades like, 304 and 316, are recognized for their excellent resistance to most forms of corrosion. Ferritic stainless steels, (some 400 series grades) are most noted for their elevated strength properties and their resistance to stress corrosion cracking (SCC).

Sheffield MDSS combines high chromium, nitrogen, and molybdenum to enhance the corrosion resistance and toughness of the steel.

Sheffield MDSS will resist fatigue failure & stress corrosion cracking.

Benefits

• Stress Corrosion Cracking (SCC) Resistance
• Pitting Resistance (PRE26)
• Corrosion Fatigue Resistance
• Crevice Corrosion Cracking Resistance
• Excellent Mechanical Properties
• Excellent Machinability & Weldability
• High Energy Absorption

Typical Mechanical Properties

Hardness 290 BHN
Tensile Strength 94,000 P.S.I.
Yield Strength 65,000 P.S.I.
Elongation 30%
Micro Finish 15 RMS
(Based on 1/2" Diameter Specimen)
National Sanitation Foundation approval for drinking water applications (NSF Section 61).
USDA approval for dairy processing applications (3-A Format for Sanitary and Practice Standards).

Typical Chemical Analysis

Cr Ni Mn Mo N
22.0 2.0 5.0 .6 max .30
C Si Cu Ph S
.04 max 1.0 .1/.8 .04 .03
Meets the following standards: UNS S32101,
ASTM A276 and A479, ASME SA479 and
ASME VIII Section II Code Case 2418

Sheffield MDSS has become the new standard stainless shafting material in many industries including; Pulp & Paper, Food Processing, Petro-Chemical, Wastewater Treatment, and Power Generation.

Service Temperature

To maintain the unusually high degree of toughness, service temperature should be limited to approx. 800°F, although Nass 45 exhibits excellent oxidation resistance to 1200°F.

Available English Sizes

3/4" 1-1/4" 1-3/4" 2-1/2" 3-15/16"
7/8" 1-5/16" 1-15/16" 2-3/4" 4"
15/16" 1-3/8" 2" 2-15/16" 4-7/16"
1" 1-7/16" 2-3/16" 3" 4-1/2"
1-1/8" 1-1/2" 2-1/4" 3-7/16" 4-15/16"
1-3/16" 1-5/8" 2-7/16" 3-1/2" 5"

Available Metric Sizes

20MM 30MM 50MM 80MM
22MM 32MM 60MM 90MM
25MM 40MM 70MM  

Available Lengths

10/12 Ft Random Lengths
20/26 Ft Random Lengths
Custom Cut Lengths

Diameter Tolerances

Bearing Fit -TGP Only (-.0005"/-.0015")

Note: Sheffield MDSS is inventoried in two surface finishes; TG&P Bearing Fit Tolerance, and Semi-Finished Oversize, for finish machining at your facility. Semi-Finished Oversize will finish to the size; 1-1/2" O.S. diameter will finish to 1-1/2" TG&P.

Material is boxed to protect during shipment.

U-Bend Testing

Stainless Grade Longitudinal / Transverse
Sheffield MDSS No SCC (after 500 hours)
304L SCC Cracking (< 150 hrs)
{in a 40% CaCl-2 boiling solution (100°C) for 500 hrs}

Stress Corrosion Cracking (SCC)

The duplex grain structure of Sheffield MDSS, with its continuous Ferritic phase means this product is much less sensitive to stress corrosion cracking (Sulfide and Chloride). Austenitic stainless grades, such as 304L and 316L are more susceptible to fracture.

Where sulfide stress cracking and stress corrosion cracking resistance are required, Sheffield MDSS.

Caustic Solution Corrosion

Testing in simulated "white liquor" shows less weight loss and superior corrosion resistance when Sheffield MDSS is compared to other common stainless steels.

High Performance Stainless Steels

Corrosion Fatigue

Sheffield MDSS resists fatigue failure in corrosive environments due to its unique combination of high strength and resistance to corrosion.

Resists Fatigue Failure

Sheffield MDSS has been evaluated (pulsating tensile fatigue) at 2 million cycles w/ a probability of rupture listed at 50.

General Machining Data

Sheffield MDSS exhibits excellent machining characteristics when compared to type 304L or 316L stainless. Superior machinability to most Duplex grades.

High Performance Stainless Steels

High Performance Stainless Steels

General Welding Information

Gas Tungsten arc TIG (GTAW)
Shielded Metal arc (SMAW)
Gas Metal arc (GMAW)
Flux-cored arc (FCW)
Submerged arc (SAW)
Plasma arc (PAW)

Resists the negative effects of localized corrosion in welding, at the heat affected zone.

Request detailed welding information.

Welding Tips

No pre-heat required. Cool between passes (below 300°F). Filler metal suggested but not required. Post weld anneal not required. If post-weld annealing is accomplished, follow with a rapid water quench to prohibit re-forming of the intermetallic phase.

When using GTAW or PAW, consider the adding of nitrogen in the shielding/purging gas to ensure optimum pitting resistance. Recommended Fillers: LDX2101 from Avesta Welding or 2209. – Request detailed welding data.

SHEFFIELD™ MDSS vs. 300 Series Commercial Stainless

  Sheffield MDSS Lean Duplex
Stainless Steel
304L & 316L
Stainless Steel
Corrosion Resistance Excellent Good
Ease of Machining Excellent Poor/Gummy
Won't hold a bright finish.
Weldability Excellent Good
Strength High Strength Poor/Not hardenable
by heat treatment
Sour Service Excellent Poor
Anti-Galling Good Poor/Parts can seize and gall
Retained Stress Less retained stress Poor/High degree of "memory"
Wear Resistance Excellent Moderate
Shock Resistance Excellent Excellent
Service Temperature 800°F 304L = 1300°F
316L = 1600°F
Tensile Strength (typ.) 94,000 P.S.I. minimum 304L = 85,000 P.S.I.
316L = 80,000 P.S.I.
Yield Strength (typ.) 65,000 P.S.I. minimum 304L = 35,000 P.S.I.
316L = 30,000 P.S.I.
Thermal Hardenability No No
Magnetic Yes No
Long Lengths
Available (typ.)
Yes No
Surface Finish
Options Available
Fine Turned Oversize
And Bearing-Fit, TGP
Centerless TGP
(+ or - Tolerances)

The above is furnished as a sales aid for comparison purposes, and represents typical properties. Data should not be used for engineering purposes. Thermally treated properties are based on approx. 28 Rc.

SHEFFIELD™ MDSS vs. 400 Series Commercial Stainless

  Sheffield MDSS Lean Duplex
Stainless Steel
410 & 416
Stainless Steel
Corrosion Resistance 3X stronger than 316L Moderate
Ease of Machining Excellent Good
Weldability Excellent Good
Strength High Strength Good
Sour Service Excellent Acceptable
Anti-Galling Good Moderate/Parts can seize and
tear during routine disassembly
Retained Stress Less retained stress Moderate/High degree of "memory"
Wear Resistance Excellent Good/Further hardening
diminishes corrosion resistance
Shock Resistance Excellent Good
Service Temperature 800°F 410 = 1100°F
416 = 1100°F
Tensile Strength (typ.) 94,000 P.S.I. minimum 410 = 140,000 P.S.I.
416 = 135,000 P.S.I.
Yield Strength (typ.) 65,000 P.S.I. minimum 410 = 130,000 P.S.I.
416 = 110,000 P.S.I.
Thermal Hardenability No Yes
Magnetic Yes Yes
Long Lengths
Available (typ.)
Yes Yes
Surface Finish
Options Available
Fine Turned Oversize
And Bearing-Fit, TGP
Hot Roll And Turned Ground
And Polished

The above is furnished as a sales aid for comparison purposes, and represents typical properties. Data should not be used for engineering purposes. Thermally treated properties are based on approx. 28 Rc.