Q255 B Special Alloy

Chemical composition%of the ladle analysis of gradeQ255 B

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)Ni(%)Cu(%)
0.18~0.28≤0.300.40~0.700.0450.045≤0.30≤0.30≤0.30

Mechanical properties


The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | than 16:255
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:245
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 40 to 60:235
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 60 ~ 100:225
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 100 ~ 150:215
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 150:205

Tensile strength σ b/MPa: 410 ~ 550
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | than 16:24
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:23
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 40 to 60:22
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 60 ~ 100:21
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 100 ~ 150:20
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 150:19
Impact test (1) | temperature / ℃ : 20
Impact test (1) | impact absorption power AKV/J: 27 frequency

The cold bending property

Sample direction: horizontal
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | than 60: d = 1.5 a
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 60 ~ 100: d = 2.5 a
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 100 ~ 200: d = 3 a
 




Mechanical properties of gradeQ255 B

Proof strength
Rp0.2(MPa)
Tensile strength
Rm(MPa)
Impact energy
KV(J)
Elongation at fracture
A(%)
Reduction in cross section on fracture
Z(%)
As-Heat-Treated Condition Brinell hardness(HBW)
345(≥) 898(≥) 12 23 44 Solution and Aging,Annealing,Ausaging,Q+T,etc 113

Physical properties of grade Q255 B

Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J/kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
141(≥) 636(≥) 21 34 31 Solution and Aging,Annealing,Ausaging,Q+T,etc 423
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0)N/mm2
Creep rupture strength
(10000h)
(Rp1,0)N/mm2
236 214 117

Q255 B Range of products

Product type Products Dimension Processes Deliver Status
Plates/Sheets Plates/Sheets 0.08-200mm(T)*W*L Forging,hot rolling and cold rolling Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Steel Bar Round Bar,Flat Bar,Square Bar Φ8-1200mm*L Forging,hot rolling and cold rolling,Cast Black,Rough Turning,Shot Blasting,
Coil/Strip Steel Coil/Steel Strip 0.03-16.0x1200mm Cold-Rolled&Hot-Rolled Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Pipes/Tubes Seamless Pipes/Tubes,Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion,Cold Drawn,Welded Annealed,Solution and Aging,Q+T,ACID-WASHED

Q255 B Steel Stock

Steel grade Dimension Shape Unit Quantity Delivery state Query
SkD-11 Round Bar Stock Φ30-Φ350 Round Bar Kgs 3102 Hot-Rolled+Annealed+black Enquiry
17-4PH Coil Stock 0.08*200mm Coil or Strip Kgs 1623 Cold-Rolled+Annealed Enquiry
D2 Round bar Φ25-Φ380mm Round Bar Kgs 45325 Hot-Rolled+Annealed+black Enquiry
Cr8 flat bar 12*355*L Flat or Square bar Kgs 3965 Forged+Annealed+black Enquiry
17-4PH Round Bar Φ5-300mm*L Round Bar Kgs 46958 Hot-Rolled+Annealed+black Enquiry
17-4PH plate 8-45*1200*3000mm Plate or Sheet Tons 4.9 Hot-Rolled+Annealed+black Enquiry
Cr12MoV 12-160(T)*310-610(W)*L Plate or Sheet Tons 12.38 Hot-Rolled+Annealed+black Enquiry
1.2601 12-160(T)*310-610(W)*L Plate or Sheet Tons 11.22 Hot-Rolled+Annealed+black Enquiry
IncoloyA-286 / GH 2132 Stock Φ8-65mm*L Round Bar Kgs 489 Hot-Rolled+Annealed+black Enquiry
Incoloy800 round bar Φ115*1400 Round Bar Kgs 169 Hot-Rolled+Annealed+black Enquiry
17-7PH / 631 Coil & Strip, Sheet Stock 0.3-3.0*10-180mm Coil or Strip Kgs 1236.22 Cold-Rolled+Annealed Enquiry
X22CrMoV12-1 / 1.4923 Φ17mm Round Bar Kgs 300 Hot-Rolled+Annealed+black Enquiry
1.2083 Forged Plate T:105-185mm*W:510*L Plate or Sheet Tons 26 Forged+QT Enquiry
X22CrMoV12-1 / 1.4923 Φ30mm Round Bar Kgs 300 Hot-Rolled+Annealed+black Enquiry
1.4882 strip/sheet/plate stock 3.5x200x1000-2000mm Coil or Strip Kgs 200 Cold-Rolled+Annealed Enquiry
A387 F5 & Grade 5 sheet Coil strip 0.5mmx200mmxC Coil or Strip Tons 3 Cold-Rolled+Annealed Enquiry
A387 F5 & Grade 5 Hot Coil stock Select Tons 3 Hot-Rolled+Annealed+black Enquiry
T45Cr5Si3 Round Bar Dia.40mm Round Bar Kgs 500 Hot-Rolled+Annealed+black Enquiry
UNS K30960(VIM+ESR) Bright Round Bar Dia.22mm Round Bar Kgs 50 Hot-Rolled+Annealed+black Enquiry
SA-437 Grade B4B/SUS 616 /422 Forged Bar Dia.160xL Round Bar Kgs 2120 Forged+QT Enquiry