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U-Shaped Radiant Tube
  • U-Shaped Radiant Tube
  • U-Shaped Radiant Tube

U-Shaped Radiant Tube

The U-type radiant tube is a commonly used device designed to prevent direct contact between fuel combustion products and the workpiece, as well as to protect heating elements from furnace atmosphere corrosion. The combustion of fuel or the conversion of electrical energy takes place inside heat-resistant steel tubes, allowing heat to be radiated through the tube walls to the workpiece. This design greatly facilitates industrial processing and production.

Our radiant tubes are designed for use not only in domestic heat treatment equipment but also as replacement components for imported heat treatment systems. In 1998, this product line was awarded the Gold Medal at the National Technology Exhibition.
The heating element (tube core) inside the radiant tube is available in several configurations: cage type, vertical strip-wound type, and spiral-wound resistance wire type. The resistance wire materials used are nickel-chromium (Ni-Cr) and iron-chromium (Fe-Cr) alloys. The surface load is typically designed at ≤1 W/cm², with single-tube power ratings ranging from 3kW to 60kW. The operating temperature of the heating element ranges from 500°C to 1300°C.
The outer protective tube is manufactured in three types: centrifugally cast tubes, rolled and welded tubes, and seamless tubes.
In terms of service life:
Quenching furnaces: ≥1 year
Tempering furnaces: ≥3 years
Gas-fired radiant tubes: ≥2 years
For sleeve tube materials, please refer to the table below.

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Technical parameters of electric heating alloy

Grade/Performance 1Cr13Al4 0Cr25Als OCr21Al₆ 0Cr2₁Al₆Nb 0Cr27Al₇NO₂ Cr15Ni₆o Cr2₀Ni₆o Cr20Ni30
Main chemical components% Cr 12-15 23-26 19-22 21.0-23.0 26.5-27.8 15-18 20-23 20 
AL 4-6 4.5-6.5 5-7 5-7 6-7
Fe Balance Balance Balance Balance Balance Balance Balance
Re Appropriate Amount Appropriate Amount Appropriate Amount Appropriate Amount Appropriate Amount Appropriate Amount Appropriate Amount Appropriate Amount
Mo 1.8-2.2
Nb 0.5  0.5 
Ni 58-62 Balance 28-32
Maximum operating temperature of components℃ 950  1250  1250  1350  1400  1100  1150  1100 
Density/cm³ 7.4  7.1  7.1  7.1  7.1  8.2  8.4  7.9 
ResistivityΩmm²/m 1.25±0.05 1.42±0.05 1.42±0.05 1.42±0.05 1.53±0.05 1.13±0.05 1.14±0.05 1.04±0.05
Temperature coefficient of resistance×10-51℃ 15  5  5  5  -1  14  8.5 
Melting Point℃ 1450  1500  1500  1500  1520  1390  1400  1390 
Tensile StrengthMPa 588-735 637-784 637-784 637-784 686-784 637-784 637-784 637-784
Elongation% >14 >12 >12 >12 >12 >20 >20 >20
Reduction of area% 65-75 65-75 65-75 65-75 65-75 60-75 60-70 65-75
Number of bends >5 >5 >5 >5 >5
Hardness 200-260 200-260 200-260 200-260 200-260 130-150 130-150 130-150
Organization Ferrites(F) Ferrites(F) Ferrites(F) Ferrites(F) Ferrites(F) Austenitic (A) Austenitic (A) Austenitic (A)
Magnetism Magnetism Magnetism Magnetism Magnetism Magnetism Non-magnetic Non-magnetic Non-magnetic

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Key Performance Table of Heat-Resistant Steel Materials

AS5 HK40 KHR 12C KHR 35H KHR S2 KHR S3 KHR 48N KHR  SA
 Chemical Composition
  (weight%)		 C 0.35/0.45 0.3/0.4 0.37/0.47 0.35/0.45 0.45/0.55 0.44/0.6 0.4/0.5
Si 1.75max. 1.0max 1.5max 2.0max 2.0max 1.5max 0.5max
Mn 1.5 max. 1.1max 1.5max 2.0max 2.0max 1.5max 0.3/0.6
Ni 19/22 13/15 34/37 22/25 33/37 45/50 47/51
Cr 23/27 23/26 24/28 24/27 24/28 25/30 28/31
Co 一 一 一 14/18 14/16 一 一
Nb 一 0.8/1.5 一 - 一 二 一
W - 一 - 1.8/2.3 4.0/6.0 4.0/6.0 12/14
Mo 0.5max. 一 1.0/1.5 一 二 一 一
Other elements 一 一 二 - 一 一 一
Tensile performance at room temperature Tensile Strength(kgf/mm²) 425min.
(43.3min.)		 440min.
(45min.)		 440min.
(45min.)		 490min.
(50min.)		 490min.
(50min.)		 390min.
(40min.)		 490min.
(50min.)
Stubborn clothing strength(kgf/mm²) 240min.
(24.5min.)		 245min.
(25min.)		 245min.
(25min.)		 245min.
(25min.)		 245min.
(25min.)		 295min.
(30min.)		 295min.
(30min.)
Elongation
(%)		 Centrifugal Casting 10min 10min  8min  8min  8min  5min 一
Static Casting 10min 10min  6min  6min  6min  5min 一
KHR 24C KHR 20T KHR 32C KHR 35C KHR 35CT
  Chemical Composition
  ( weight % )		 C 0.25/0.35 0.35/0.5 0.11/0.16 0.4/0.5 0.45/0.55
Si 1.0 max. 1.5 max. 1.2max. 1.5max. 1.5 max.
Mn 1.5max. 2.0 max. 1.5max. 1.5max. 2.0 max.
Ni 23/26 19/25 33.5/35.5 34/37 33/37
Cr 23/26 23/27 19/20.5 24/28 24/27
Nb 1.0/2.0 0.5max 0.6/1.6 0.6/1.5 1.0 max.
Mo 0.5max. 一 一 一 -
Other elements Addition 一 一 Addition
Tensile performance at room temperature Tensile Strength(kgf/mm²) 440min.
(45min.)		 440min.
(45min.)		 440min.
(45min.)		 440min.
(45min.)		 440min.
(45min.)
Stubborn clothing strength(kgf/mm²) 245min.
(25min.)		 245min. 175min.
(18min.)		 235min. 25min.)

Elongation
(%)		 Centrifugal Casting 15min 10min 30min 8min 8min
Static casting 12min 8min 25min 6min 6min
KHR35H-HiSi KHR   35CL KHR 30A KHR35C-HiSi KHR    35CW KHR35CT-HiSi KHR   35W KHR   45A
  Chemical Composition
( Weight % )		 C 0.37/0.47 0.18/0.23 0.55/0.65 0.4/0.5 0.4/0.5 0.45/0.55 0.4/0.5 0.4/0.6
Si 1.5/2.0 0.5/1.2 2.5 max. 1.5/2.0 1.5/2.0 1.5/2.0 2.0 max. 2.0 max.
Mn 1.5max. 1.5max. 1.5 max. 1.5max. 1.5 max. 2.0 max. 2.0 max. 2.0 max.
Ni 34/37 36.5/38.5 29.5/32.5 34/37 34/37 33/37 34/37 40/46
Cr 24/28 24/26 22/25 24/28 24/28 24/27 24/28 30/35
Nb 一 1.5max. - 0.6/1.5 1.1/1.7 1.0 max. - 0.5/1.8
W - - - - 0.5/1.5 - 3/4.5 -
Mo 1.0/1.5 一 一 - 0.3/0.8 一 - -
Other elements 一 - Addition - Nd+W+Mo
3.0max.		 Additon 一 Addition
Tensile performance at room temperature Tensile Strength(kgf/mm²)  440min.
  (45min.)		  440min.
  (45min.)		 440min.
  (45min.)		 440min.
(45min.)		   440min.
  (45min.)		   440min.
  (45min.)		   440min.
  (45min.)		   440min.
  (45min.)
Stubborn clothing strength(kgf/mm²)  235min.
  (24min.)		 185min.
(19min.)		 225min;
  (23min.)		 225min.
(23min.)		 235min
(24min.)		 225min
(23min.)		 235min.
(24min.)		   235min.
  (24min.)
Elongation
(%)		 Centrifugal casting 8min 25min 5min 8min 8min 8min 5min 5min
Static casting 6min 20min 6min 6min 6min 3min 3min

Typical Material Technical Parameters

Mechanical properties at room temperature
Serial Number Steel Grade Yield Strengthαs
≥Mpa		 Tensile Strengthαb
≥Mpa		 Elongationδ
   ≥%
1  ZG30Cr28Ni4 345 
2  ZG50Cr28Ni6 560 
3  ZG35Cr24Ni7SiN 340  540  12 
4  ZG35Cr28Ni10 275  490  8 
5  ZG30Cr26Ni12 235  490  8 
6  ZG33Cr25Ni14 235  490  8 
7  ZG35Cr28Ni16 235  490  8 
8  ZG30Cr25Ni20 245  440  10 
9  ZG40Cr25Ni20 235  440  10 
10  ZG40Cr25Ni20Si2 245  431  10 
11  ZG45Cr24Ni24NbTi 245  441  8 
12  ZG30Cr30Ni20 245  450  8 
13  ZG40Cr30Ni20 245  450  8 
14  ZG40Ni25Cr21 390  5 
15  ZG14Ni32Cr20Nb 186  448  25 
16  ZG40Ni35Cr25 235  440  5 
17  ZG40Ni35Cr25Nb 245  441  8 
MECHANICAL   PROPERTIES   AT   ROOM   TEMPERATURE
Serial Number Steel Grade Yield Strengthαs Tensile Strengthαb Elongationδ
≥%
18  ZG40Ni35Cr25NbW 221  448  8 
19  ZG50Ni35Cr17 440  4 
20  ZG50Ni39Cr19 440  4 
21  ZG45Ni48Cr28W5Si2 242  392  3 
22  ZG40Ni48Cr30W15Si2 295  490  2 
23  ZG50Ni36Cr26Co15W5 315  480  3 
24  ZG42Ni33Cr25Nb 250  450  8 
25  ZG45Ni35Cr27NbW 265  448  12 
26  ZG50Ni48Cr18W5 245  448  3.5 
27  ZG10Ni32Cr20Nb 186  448  25 
28  ZG45Ni48Cr28W5Co5 242  448  5 
29  ZG35Ni24Cr18Si2 195  390  5 
30  ZG30Ni35Cr15 195  440  13 
31  ZG45Ni35Cr25NbM 250  450  8 
32  ZG40Ni35Cr25W4 250  450  7 
33  ZG35Cr24Ni7SiN(Re) 340  540  12 
34  ZG10Ni35Cr25Nb 186  448  25 
S T R E S S - R U P T U R E  P R O P E R T I E S
Grade 700℃ 800℃ 900℃ 1000℃ 1100℃
Tensile Strength，
αb≥Mpa		 Extension，
δ5≥%		 Tensile Strength，
αb≥Mpa		 Extension，
δ5≥%		 Tensile Strength，
αb≥Mpa		 Extension，
δ5≥%		 Tensile Strength，
αb≥Mpa		 Extension，
δ5≥%		 Tensile Strength，
αb≥Mpa		 Extension，
δ5≥%
ZG45Ni35Cr27NbW 147  53  97  62  63  65 
ZG14Ni32Cr20Nb 86.2  24.8 
ZG10Ni32Cr20Nb 296  39  196  49  102  67  68  75 
ZG10Ni35Cr25Nb 275(750℃) 36(750℃) 150(850℃) 44(850℃) 83(950℃) 54(950℃) 55(1050℃) 62(1050℃)
ZG40Ni35Cr25Nb 265  20  147  30  93  38  61  39 
ZG45Ni35Cr25NbM 256  31  172  38  117  43  82  45 
ZG40Ni35Cr25W4 243  26  175  33  118  40  70  47 

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