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UNS T51621 / AISI P21 Nickel Based Tool Steel
UNS T51621 / AISI P21 Nickel Based Tool Steel

UNS T51621 / AISI P21 Nickel Based Tool Steel

Product parameters
Material Technical Standards:: ASTM A681 - 2004
Place of Origin: P.R. China
Min. order quantity Per Batch:: 1300 KG
Product Shapes:: Round bars, flat bars, forgings, ring
Standard Export Packing Way:: Wooden box, pallet / tray free from fumigation
Production Lead Time:: Within 55 days after 40% deposit prepayable
Company ISO Register No:: UQ211218R0
INQUIRY
Description
 
The alloy is usually produced by BEF & AOD followed by electroslag remelting (ESR) / VAR if necessary for special purpose.
Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different levels according to the buyers' requirements. Bars are usually supplied black/bright in the annealed condition.

Tool steel is to fabricate the cutting tool, measuring implement, mould, and wear-resisting tool, it possesses higher hardness and keeps maintaining the high hardness and redhardness under high temperature, and more abrasive resistance, proper toughness. Tool steel is commontly divided into carbon tool steel, alloy tool steel, high speed steel.  
 
Alloy tool steel is one type of steel adds the alloying elements in the carbon tool steel, such as Si, Mn, Ni, Cr, W, Mo, V. Adding the elements (Cr, Mn) can improve the hardenability of tool steel. Or adding other alloying elements meanwhile (the gross is not more than 5%).
Alloy tool steel is widely used to produce the cutting tool, cold/heat distortion mould and measuring implement. and further to manufacture the piston, valve, valve seat of fuel pump of engine.

Chemical Composition (Weight %)
C (％) 0.18 ～ 0.22
Si(％) 0.20 ～ 0.40
Mn(％) 0.20 ～ 0.40
P(％) ≤ 0.030
S (％) ≤ 0.030
Cr (％) 0.20 ～ 0.30
Ni (％) 3.90 ～ 4.25
Mo(％) -
Other (％) V 0.15 ～ 0.25
Al 1.05 ～ 1.25

Mechanical Properties
Condition of heat treatment annealing
Tensile Rm (MPa) -
Yield Rp0.2 (MPa) -
Elongation A (%) -
Reduction in cross section on fracture Z (%) -
Impact AKV/AKU (J) -
Brinell Hardness (HBW) -

Shapes and dimension:
Round bar (Diameter): 5.50 ~ 650mm
Square bar / Flat bar: 3 ~ 650mm
Wire rod (Diameter): 0.10 ~ 16mm
Steel strip via cold rolled: T0.1 - 3mm X W5 - 650mm X L (or in coil form)
Forging piece: Different shapes based on OEM

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