N9E, U9A, C85W, 1.1830, У9А - Carbon tool steel for deep and low hardening

Standard Grade
Chemical composition %
C: Si: Mn: P: S: Cr: Ni: Cu:
ISO C90U - 1.1535
0.85-0.95 0.15-0.3 0.15-0.4 <0.030 <0.030 - - -
DIN C85W - 1.1830
0.8-0.9 0.1-0.3 0.1-0.35 <0.030 <0.030 - - -
PN N9
0.85-0.94 0.15-0.35 0.15-0.35 <0.030 <0.030 <0.2 <0.25 <0.25
STAS OSC 8M
0.8-0.9 0.15-0.35 0.35-0.80 <0.030 <0.025 <0.2 <0.25 <0.25
GOST U9A - У9А
0.85-0.94 0.17-0.33 0.17-0.28 <0.025 <0.018 <0.2 <0.25 <0.25
BS BW1
0.85-0.95 <0.3 <0.35 <0.15 - <0.15 <0.2 -
PN N9E
0.85-0.94 0.15-0.3 0.15-0.3 <0.025 <0.025 <0.15 <0.2 <0.2

U9A /  / C85W steels – description

Punch steel. Can be used for drills.

Main features:

  • High impact resistance
  • Hard material
  • Sufficient grinding resistance

Applications

This alloy is widely used for:

  • Chisels
  • Punches
  • Cutters
  • Wood tools
  • Screw taps

Mechanical and physical properties

Hardness is in this case the most important feature.

Norm Grade Max HB hardness as soft annealed Max HB hardness as quenched
ISO TC90 207 -
GOST U9 192 62
GOST U9A 192 62
PN N9 197 62
PN N9E 197 62
UNI C90KU 207 60
BS BW1 207 -

Other properties:

Grade: N9 N9E U9A
Electrical resistivity: 1.76 μΩ*m 1.76 μΩ*m -
Density: 7.851g/cm3 7.851g/cm3 7.81g/cm3
Specific heat capacity: 498 J/kg*K 498 J/kg*K -
Linear expansion coefficient: 10.84 (10^6)/OC 10.84 (10^6)/OC -

Quenching

N9 differs from N9E in it’s hardening capacity, similarly to U9 and U9A. U9 and N9 are deep hardening steels, and U9A as well as N9E are shallow hardening ones.

In this case shallow-hardening steel exhibit better impact resistance than it's deep hardening counterpart.

Largest grain size on a fracture / hardening depth on rode fracture, mm
Temperature [℃]
Largest grain size on a fracture / hardening depth on rode fracture, mm 760 800 840 880
Deep hardening steel N9 7 / 5 7 / 6 6 / 8 5 / 12*
Shallow-hardening steel N9E 7 / 3 7 / 4 7 / 4 7 / 5

* ATTENTION! Hardening cracks on a fracture are likely.


Heat treatment and plastic working

Following parameters are recommended for working and heat treatment

N9E heat treatment and forging
Process Cooling Temperature [℃]
Forging ash or sand 1000–800℃
Soft annealing any 680–710℃
Stress relief slow 600-700℃
Quenching water 760-780℃
Tempering air 180-300℃

Welding

Tool steel of this kind is not easy to weld, thus welding should be considered only for repairs.

Following coated electrodes can be used: ENS 50 B, ENS 15CrB, ENS 18, EN 450 B, EN 600 B, WBEN 280 MoB, EN 350 B.

We deliver this steel alloy as:


Replacements, equivalents and other designations:

T9A, U9A, C90E2U, 1.1535, C90U, 1.1625, BW1A, N9, OSC8M, TC90, 43962, 43961, SK5, 19192, W1-8½, C90KU


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