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201 不锈钢 MSDS

201 不锈钢 MSDS
201 不锈钢 MSDS

North American Stainless

Flat Products Stainless Steel Grade Sheet

201 (S20100)

201LN (S20153)

EN 1.4372 Introduction:

SS201 is a lower-cost alternative to the conventional Cr-Ni austenitic stainless steels,

such as SS304. About half of the nickel content of SS304 is replaced with alloy additions

of manganese and nitrogen. This results in a higher strength than SS304. Copper is added

to compensate for the increased work-hardening rate. SS201 thus has relatively lower

ductility and formability compared to 304/301 SS. It also has excellent low-temperature

properties. SS201 has good welding characteristics. Post-weld annealing is not required

for the low-carbon grade to restore the excellent performance of this grade in a wide

range of mildly corrosive conditions.

SS201 has good formability and corrosion resistance and this makes it suitable for

applications such as hollowware, catering equipment, kitchen consumer equipment and

abattoir equipment, including items requiring moderate drawing. The good strength

ensures suitability in applications such as strapping, clamps and cable racking. The

excellent low-temperature properties make it suitable for cryogenic vessels.

Product Range:

Product is available in Cold Rolled, Continuous Mill Plate and Plate Mill Plate form up to

60" wide in various thicknesses.

For inquiry about minimum quantity, specific thickness and tolerances contact inside

sales at NAS.

Certification:

ASTM A240, A480, A666, ASME SA240, SA480, SA666, ASTM A262

Chemical Composition:

UNS ASTM Carbon Manganese Phosphorous Sulfur Silicon Chromium Nickel Nitrogen Copper S20100 201 0.15max 5.5-7.5 0.06max 0.03 max 1 max 16-18 3.5-5.5 0.25 max

S20153 201LN 0.03max 6.4-7.5 0.045 max 0.03 max 0.75 max 16-18 4.0-5.0 0.01-0.25 1 max

Mechanical Properties:

Tensile strength min Yield Strength min Elongation min Hardness max

201 75 ksi 38 ksi 40% 95HRB

201LN 95ksi 45 ksi 45% 100 HRB

Note: Enhance properties available upon request.

PROPERTIES AT ELEVATED TEMPERATURE:

PHYSICAL CHARACTERISTIC:

THERMAL PROCESSING & FABRICATION

ANNEALING

Annealing is achieved by heating to above 1900°F for 90 minutes per 25mm thickness followed by water or air quenching. The best corrosion resistance is achieved when the final annealing temperature is above 1950°C. Controlled atmospheres are recommended in order to avoid excessive oxidation of the surface.

STRESS RELIEVING

SS201LN can be stress relieved at 400°C to 500°C for 90 minutes with little danger of sensitization. If stress relieving is carried out above 450°C for regular higher carbon 201 SS, then there is a serious threat of grain boundary sensitization occurring with a concomitant loss in corrosion resistance.

HOT WORKING

SS201 can be readily forged, upset and hot headed. Uniform heating of the steel in the range of 1150°C to 1250°C is required. The finishing temperature should not be below 900°C. Upsetting operations and forgings require a finishing temperature between 930°C and 980°C. Forgings should be air cooled. All hot-working operations should be followed by annealing, pickling and passivation to restore the mechanical properties and corrosion resistance.

COLD WORKING

SS201 has moderate toughness and ductility, can be readily drawn, stamped, headed and upset without difficulty. SS201 work hardens easily compared to other austenitic stainless steel such as 304, 301, hence severe cold-forming operations should be followed by annealing.

WELDING

SS201 has good welding characteristics and is suited to all standard welding methods. Type 308L filler wire can be used. Nitrogen-containing shielding gases are recommended. The weld discoloration should be removed by pickling and passivation to restore maximum corrosion resistance.

CORROSION RESISTANCE

UNIFORM CORROSION

SS201 has good general corrosion resistance in a wide variety of corrosive media, including foodstuffs, sterilising solutions, most organic chemicals and dyes and a wide variety of inorganic chemicals.

PITTING CORROSION

Pitting resistance is important, mainly in applications involving contact with chloride solutions, particularly in the presence of oxidizing media. These conditions may be conducive to localized penetration of the passive surface film on the steel; and a single deep pit may well be more damaging than a much greater number of relatively shallow

pits. Where pitting corrosion is anticipated, steels containing molybdenum (such as 316L) should be considered. The pitting resistance of SS201 lies between that of SS430 and SS304.

Pitting resistance equivalent numbers (PREN) are a theoretical way of comparing the pitting corrosion resistance of various types of stainless steels, based on their chemical compositions. The PREN (or PRE) numbers are useful for ranking and comparing the different grades , but cannot be used to predict whether a particular grade will be suitable for a given application, where pitting corrosion may be a hazard.

Typical PREN on NAS grades and comparison are shown below.

PREN Austenitic Stainless at NAS

17.50

18.0018.5019.0019.5020.0020.50304

301

201LN

201

P R E N

The resistance to pitting and crevice corrosion in oxidizing chloride environments was evaluated using ASTM G48 methods A and B. Samples of alloy types 304, 301, 201, and 430 were exposed for a period of 72 hours at 22o C in oxidizing chloride acid. The results are summarized in Table 2. Type 304 Type 301 Type 201 Type 430 ASTM G48 A

Pitting Test Mass Loss .0063 g/cm 2 .0105 g/cm 2 .0098 g/cm 2 .0280 g/cm 2

ASTM G48 B

Crevice Test

Mass Loss .0067 g/cm 2 .0086 g/cm 2 .0130 g/cm 2 .0265 g/cm 2

Table 2. Results of ASTM G48 A and B Pitting and Crevice Corrosion Tests

OXIDATION

SS201 has good oxidation resistance at temperatures up to 780°C. Continuous use of SS201 in the 450°C to 850°C temperature range is not recommended due to carbide and nitride precipitation.

ATMOSPHERIC CORROSION

The atmospheric corrosion resistance of CS201 in urban and rural areas is very good. SS201 is not recommended for marine or severely polluted industrial environments.

INTERGRANULAR CORROSION

Sensitization may occur when the heat- affected zone of welds in SS201 is cooled through the sensitizing temperature range of between 450°C and 850°C. At these temperatures, a compositional change may occur at the grain boundaries. If a sensitized material is then subjected to a corrosive environment, intergranular attack may be experienced. This corrosion takes place preferentially in the heat-affected zone away from the weld.

STRESS CORROSION CRACKING

Stress corrosion cracking (SCC) can occur in austenitic stainless steels when they are stressed in tension in chloride environments at temperatures in excess of about 60°C. The stress may be applied, as in a pressure system, or it may be residual arising from cold working operations or welding. Additionally, the chloride ion concentration need not be very high initially, if locations exist in which concentrations of salt can accumulate. Assessment of these parameters and accurate prediction of the probability of SCC occurring in service is therefore difficult. Where there is a likelihood of SCC occurring, a beneficial increase in life can be easily obtained by a reduction in operating stress and temperature. Alternatively, specially designed alloys, such as duplex stainless steels, will have to be used where SCC is likely to occur.

Technical Service: For more information, email

qualitycontrol@https://www.wendangku.net/doc/6915882004.html,

For new product development requirements, contact sales@https://www.wendangku.net/doc/6915882004.html, DISCLAIMER

The material contained in this Web Page/Sheet has been designed as a guide for customers of North American Stainless. However, the material contained herein is not intended as a substitute for any person’s procedures and should not be used or relied upon for any specific or general application without first obtaining competent advice. Furthermore, North American Stainless disclaims any responsibility for the suitability of the steel in question for any particular purpose or for the performance or selection of the steel, unless North American Stainless specifically authorizes the purpose or selection. The material contained in this Web Page/Sheet does not purport to be a comprehensive or exhaustive statement of all relevant material applicable to special and general steel products and no representation, condition or warranty, express or implied, is given by North American Stainless as to the accuracy or completeness of this Web Page/Sheet and, so far as is permitted by law, North American Stainless, its members, staff and consultants disclaim any duty of care in relation to the preparation of this Web Page/Sheet and the information that it contains and shall not be liable for any direct, indirect or consequential loss, damage or injury suffered by any person, howsoever caused as a result of relying on any statement in or omission to this Web Page/Sheet and any such liability is expressly disclaimed. North American Stainless shall not be liable in the event of a breakdown, malfunction or failure occurring due to faulty design, material or workmanship of the steel, whether based on the information contained herein or not, and shall not, under any circumstances, be liable for any damages, either direct or

indirect, particularly consequential damages, including but not limited to damages for loss of profits.

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