» UNS S41000» ASTM A276» ASTM A484» ASTM E381. » Hunting Rifles» Tactical Rifles» Competition Rifles» Pistol Barrels

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1 COMPARABLE STANDARD Typical Analysis % C Si Mn P S Cr Ni Minimum Maximum DESCRIPTION Ugitech s 410RS is a pre-hardened chrome bearing martensitic stainless steel specifically designed for the precision rifle barrel industry. The 410RS chemistry is balanced to provide the optimum machining characteristics for gun barrel drilling and reaming - while also offering the optimal combination of high tensile strength and good toughness to withstand the typical chamber pressures when fired. CLASSIFICATION Free machining martensitic stainless steel. Oxidation resistance in continuous service to 1200 F (650 C). CHARACTERISTICS» UNS S41000» ASTM A276» ASTM A484» ASTM E381 Ugitech 410RS comes pre-hardened to HRc 26/32, but can be produced to your specific hardness requirements. The precision finished bars are properly stress relieved to provide the superb straightness necessary to avoid movement during processing, while also offering good corrosion resistance which will reduce fouling and provide a durable finish. APPLICATIONS» Hunting Rifles» Tactical Rifles» Competition Rifles» Pistol Barrels AVAILABLE FORMS Ugitech s 410RS is 100% ultrasonic tested. The mill s stringently controlled production will deliver heat to heat consistency that is unsurpassed in the industry. Every step is monitored from melt, rolling, heat treatment, cold finishing, final bar inspection, and packaging. Once an optimum set-up has been established, machinists can take advantage of increased machine efficiency rates, avoiding machining issues due to hard spots. Ugitech 410RS can provide a significant competitive advantage to custom barrel makers that demand efficient, high volume and reliable production, while offering champion results. Cold Drawn bars, Turned bars, Ground bars, Cut-To- Length ADDITIONAL SERVICES We offer such value added services as:» Full Cutting Service» Stocking Programs» Chamfering» Center hole» Facing 09/22/ R-0915 Page 1

2 MECHANICAL PROPERTIES (TYPICAL) Cold Drawn Bars (1.00 and under)» Tensile Strength ksi ( MPa)» Yield Strength (0.2) ksi ( MPa)» Elongation 5% Minimum» Reduction of Area 40% Minimum» Hardness HRc ( BHN) PHYSICAL PROPERTIES (TYPICAL) Density lbs/in 3 (7.6 g/cm 3 ) Round bar weight per ft (lbs) X (½ bar diameter in inches) 2 Hexagonal bar weight per ft (lbs) 2.87 X (bar diameter in inches) 2 Square bar weight per ft (lbs) 3.31 X (bar diameter in inches) 2 CORROSION RESISTANCE Barrels made from Ugitech s 410RS offers good corrosion resistance in moderately aggressive, nonchlorinated media (e.g. soaps, solvents, and organic acids), fresh water, steam, many petroleum products, and mold atmospheres. Care should be taken when specifying 410RS for use in environments that encourage localized attack such as pitting and crevice corrosion. Competent design should avoid areas that will allow corrosive products to collect and stagnate while in service. In general 410RS (HRc 26-32) barrels represent the optimum condition for corrosion resistance at all levels of competition and in all conditions dry, damp, or salty. Mean Coefficient of ºF ( ºC) = 6.0 x 10-6 Linear Expansion in/in/ºf (10.8 x 10-6 cm/cm/ C) Modulus of Elasticity in Tension 29.7 x 10-6 psi (205,000 MPa) Thermal Conductivity FORGING (HOT WORKING) 14.4 Btu/ft/hr/ºF (25.1 F (20 C) 410RS can be forged. The following heating and handling conditions are recommended.» Slow heating to 1565º F (850º C), then more rapidly to º ( º C)» Forge in the range of º F ( ºC)» After forging, slow cooling in the furnace or vermiculite MAGNETIC AND ELECTRICAL PROPERTIES Typical Magnetic Permeability:» Magnetic in all conditions. Electrical Resistivity» 22 µω - in (550 µω - 68 F (20 C) The corrosion resistance of a stainless steel depends on many factors related to the composition of the corrosive element, ph, temperature, velocity, agitation, cervices, deposits, dissimilar metal contact, metallurgical condition, as well as the preparation of the surface. The following table is for comparative purposes only and illustrates the performance in different environments. Consult your local SCHMOLZ + BICKENBACH USA metallurgist to discuss your application. Optimum corrosion resistance requires that parts be smooth, and free from surface contamination such as cutting fluid and foreign particles. Under these conditions, parts will be passive in the air. Due to complexity and cost, passivation of 410RS should be avoided. However, if passivation is required, the following treatment is recommended (reference ASTM A380):» Solution: 20 50% nitric acid wt. sodium dichromate at F (20-50 C).» Treatment: Immerse for minutes followed by thorough rinsing to remove all residual solution. 09/22/ R-0915 Page 2

3 ENVIRONMENT Nitric Acid Humidity Phosphoric Acid NaCl (Saline Mist) Sulfuric Acid Seawater Acetic Acid Petroleum Sodium Carbonate BEHAVIOR HARDENING Ugitech s 410RS can be hardened and tempered to different hardness ranges for different applications. The hardening should be performed at 1750ºF (950ºC), followed by air or oil quenching. Oil quenching should be used on larger sections. Air quenching smaller section can reduce quench hardness by one or two Rockwell points. Typical max. quench hardenability ranges form HRc 41 to HRc 43. It is important to note, maintaining corrosion resistance at weld zones will require cleaning and passivation. HARDENABILITY (COLD WORKING) 410RS is hardenable by heat treatment. Strength and hardness increase slightly upon cold work such as drawing and forming. WELDING Ugitech s 410RS has limited weldability due to its hardenability. Special consideration should be given to avoid cold cracking by pre-heating the part between 200/575 F (100/300 C). Post well heat treatment should be considered to achieve the desired properties whether annealed or treated. If weld filler is needed, AWS E/ ER 410 or 309L can be used. Welding gases containing hydrogen or nitrogen should be avoided. HEAT TREATMENT The tempering temperatures should be selected depending on desired final properties required - see 410 hardenability chart. Strength (KSI) Tensile 0.2% Yield Elongation Impact Hardenability Curve Temperature ( C) Elong (%) / Impact daj/cm 2 Full Annealing» Heating to 1650ºF (900ºC), followed by slow cooling in the furnace. Sub-critical anneal» Heat 1300 F to 1380 F (700 C to 750 C) followed by air cooling 09/22/ R-0915 Page 3

4 Caution: Tempering of 410RS in the range of ºF ( ºC) results in reduced corrosion resistance and decreased impact strength. However, it may be necessary to temper in this range to obtain necessary strength levels. Care should be taken in the design of parts to compensate for these reduced properties. Contact your local SCHMOLZ + BICKENBACH USA application engineer with specific concerns. Having direct control of both the mill, and our own distribution, we have metallurgists on staff to offer technical advice, as well as a metallurgical lab that is located in North America. We can also offer customized chemistries and semi-finished products as well (such as barrel blanks). HEAT TREAT SIZE CHANGE 410RS will shrink during the tempering process. There can be between to in/in contraction. STRESS RELIEVING 410RS can be stress relieved as follows: Hardened and tempered - Heat and hold 50 F to 100 F (10 C to 40 C) below tempering temperature for 4-7 hours, slow cool. MACHINABILITY The key to 410RS lies in the production process. Careful control of alloy content and distribution of metallurgical phases results in better tool life, improved surface finish, and excellent chip control across a wide range of cutting conditions. The table on the following page provides a useful guideline for initial set-up. To realize the optimal potential of either grade, contact your local application engineer. A review of your current set-up will allow specific recommendations adapted to 410RS. 09/22/ R-0915 Page 4

5 HSS TOOLING COATED CARBIDE TOOLS Machining Metallurgical Depth of cut Cutting Feed (ipr) Type of Tool Cutting Feed (ipr) Type of Tool Operations Condition or width (in.) Speed SFPM Speed SFPM Turning Cold Drawn M2-M3 (T15) C C C6 Annealed C C C6 Forming & Cold Drawn M2-M3 (T15) C6 Grooving C C C C6 Annealed C C C C C6 Shaving & Cold Drawn M2-M3 (T15) C6 Skiving C C C C6 Annealed C C C C C6 Cut-Off or Cold Drawn M41 (T15) C6 Part-Off C C6 Annealed C C C6 09/22/ R-0915 Page 5

6 HSS TOOLING COATED CARBIDE TOOLS Machining Metallurgical Depth of cut Cutting Feed (ipr) Type of Tool Cutting Feed (ipr) Type of Tool Operations Condition or width (in.) Speed SFPM Speed SFPM Gun Drilling All M C5-C6 or C1-C TiN Coated Insert Drilling All C C C5 Reaming All M2 (M42) C5-C or C TiN Coated Tapping All All M2-M7 TiN Coated The machining data presented within all tables and graphs represent typical working ranges based on field and laboratory research. Results will vary based on parts to be produced, equipment and tooling utilized, personnel operating the equipment and customer part specifications. For additional information, contact Technical Support at the Corporate Office: (800) /22/ R-0915 Page 6

7 NORTH AMERICAN DISTRIBUTION HEADQUARTERS + MANUFACTURING + TECHNICAL SUPPORT CENTRAL STOCKING FACILITY SCHMOLZ + BICKENBACH USA, INC. SCHMOLZ + BICKENBACH USA, INC. 365 Village Dr E. Wilson Street Carol Stream, IL Batavia, IL Phone: Fax: DISTRIBUTION LOCATIONS WEST COAST MIDWEST 556 Vanguard Way 365 Village Dr Winpark Rd Miller Pkwy. Brea, CA Carol Stream, IL New Hope, MN Streetsboro, OH SOUTHEAST NORTHEAST 1425C S. Buncombe Rd. 370 Franklin Turnpike Greer, SC Mahwah, NJ CANADA SCHMOLZ + BICKENBACH CANADA, INC Vipond Dr. Mississauga, ONT L5T 1G2 LEGAL NOTICE All statements regarding the properties or utilization of the materials or products mentioned are for the purposes of description only. Guarantees regarding the existence of certain properties or a certain utilization are only valid if agreed upon in writing. 09/22/ R-0915 Page 7