AISI 4317h Alloy Steel Hollow Bar

• Customization: Available
• After-sales Service: Technical/Sample/Quality
• Warranty: One Year
• Model NO.: 4317H
• Type: Seamless
• Technique: Rolled or Forged
• Material: Alloy Steel
• Surface Treatment: Black/Peeled/Polished
• Usage: Oil/Gas Drilling
• Section Shape: Round
• Transport Package: Anticorrosion Seaway Packages
• Specification: OD 30-850mm
• Trademark: SHUNFU
• Origin: China
• Production Capacity: 100000 Tons Per Year

Product Description

4317 is a 1.8% chromium - nickel - molybdenum high hardenability, case hardening (carburizing) steel, generally supplied in the annealed condition with a maximum brinell hardness of 229 (Rc22). Characterised by high core strength and toughness in medium to large sections with case hardness up to Rc62 when carburized, hardened and tempered. 4317 can also be used (uncarburised) as a high tensile steel, which when suitably hardened and tempered can be utilized for various applications requiring good tensile strength and toughness. Pre hardened and tempered (uncarburized) 4317 can be further surface hardened by nitriding but will not respond satisfactorily to flame or induction hardening due to its low carbon content. 4317 (carburized) is used extensively by all industry sectors for components and shafts requiring high surface wear resistance, high core strength and impact properties.
 

Application:

Typical uses are: Heavy Duty Bushings and Bearings, Cam Followers, Clutch Dogs, Compressor Bolts, Extractors, Fan Shafts, Heavy Duty Gears, Pump Shafts, Sprockets, Tappets, Wear Pins, Wire Guides etc.

Advantages

Excellent strength-to-weight ratio
High tensile strength, ductility, and toughness
Lighter and more robust than carbon steel
Easy to weld, form, and machine
Ability to harden using heat-treating or work hardening
 

SIZE RANGE

OD : 1.250" - 31.250"
OD Tolerance:  +/- .005" (up to 1.500" OD),  to +/- .010" (above 1.500" OD)
Wall thickness : 0.100"- 3.150"
Wall Tolerance:  +/- 10% (For ID Over .500") to +/- 15% (for ID under .500")
17.000" - 24.000" random lengths (Cut to Length available)
 

Grade Compare:

Related Specifications
Australia	AS1444 - 1996 4317/4317H
Germany	W.Nr 1.6587 DIN 17210 17CrNiMo6 18CrNiMo 7-6
Great Britain	BS970: PART 3: 1991 820M17/822M17 BS970: 1955 - EN354/EN355
USA	SAE 4317 AISI 4317

 

Chemical Composition:

Chemical Composition
	Min. %	Max. %
Carbon	0.15	0.21
Silicon	0	0.40
Manganese	0.50	0.90
Nickel	1.40	1.70
Chromium	1.50	1.80
Molybdenum	0.25	0.35
Phosphorous	0	0.035
Sulphur	0	0.035

 

Mechanical Properties:

Typical Mechanical Properties - Annealed
Tensile Strength Mpa		700
Yield Strength Mpa		520
Elongation on 5.65√S0 %		23
Hardness	HB	200
	Rc	15

 

Forging:

Heat to 1150ºC and hold until temperature is uniform throughout the section. Soaking time at forging temperature should be as short as possible to avoid heavy scaling and excessive grain growth. This will vary depending on furnace conditions but 15 minutes per 25 mm of section may be used as a guide. Do not forge below 850 ºC. Following completion of forging operation, work piece should be cooled as slowly as possible in sand or dry lime etc. Note: Case hardening steels due to their low carbon content are less susceptable to cracking than medium or high carbon steels, and may therefore be heated and cooled more rapidly.
 

Heat Treatment:

1 Annealing: Heat to 830ºC - 850ºC, hold until temperature is uniform throughout the section and cool in furnace.
2 Caburizing: Pack, salt or gas carburize at 900ºC - 930ºC, holding for sufficient time to develop the required case depth and carbon content, followed by a suitable hardening and tempering cycle to optimise case and core properties.
3 Nitriding: Not suitable for nitriding.
4 Normalizing: Heat to 860ºC - 900ºC, hold until temperature is uniform throughout the section. Soak for 10 - 15 minutes and cool in still air.
 

Refining & Hardening:

1 Core Refine: Slow cool from carburizing temperature and re-heat to 840ºC - 870ºC, hold until temperature is uniform throughout the section, quench as required in warm water, oil or air cool. Alternatively quench in salt bath held at 150ºC - 250ºC followed by air cool.
2 Case Refining:Following core refining, re-heat to 780ºC - 820ºC, hold until temperature is uniform throughout the section, and quench in oil.
Temper immediately while still hand warm.
3 Single Refine: Direct Quench: Cool from carburizing temperature to 820 ºC- 840 ºC, hold until temperature is uniform throughout the section. Quench in oil.Temper immediately while still hand warm. Or: Cool from carburizing temperature to room temperature, re-heat to 820 ºC - 840 ºC and hold until temperature is uniform throughout the section and quench in oil.
Temper immediately.
4 Stress Relieving: Heat to 630ºC - 650ºC, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm section, and cool in still air.
5 Tempering: Heat to 150ºC - 200ºC as required, hold until temperature is uniform throughout the section, soak for 1 - 2 hours per 25 mm of section, and cool in still air. N.B. Tempering will improve the toughness of both case and core, with only a slight reduction in core strength and case hardness. It will also reduce the susceptibility of the case to grinding cracks.
 

Other Property:

Machining: 4317 in the annealed as supplied condition has very good machinability and all operations such as turning, drilling,milling and tapping etc. can be carried out satisfactorily as per machine manufacturers recommendations for suitable tool type - feeds and speeds.
Welding: 4317 is readily weldable in the annealed as supplied condition. Following welding, the work piece immediately upon cooling to hand warm should be stress relieved at 630ºC - 650ºC if possible. N.B. Welding in the carburized and heat treated condition is not recommended.
Welding: Welding of 4317 should always be carried out using low hydrogen electrodes - please consult your welding consumables supplier.