Equivalence

Chemical Composition (%)

Mechanical Properties

Delivery Condition 

-EAF+(ESR) or EAF+LF+VD+(ESR)

-HOT rolled or Forged, Annealed

-Hardness≤235HB

-Surface Finish: Black, Rough Machined, Peeled, Turned or as per given requirements

-UT 100% passed

-Cutting service provided

-Third Party inspection is acceptable (SGS, BV etc.)

Applications

H21 Hot work steels are Suitable for the manufacture of complex shapes, impact load, the working temperature is not too high, mold sheet product is suitable for forging press mold, concave and convex die, die casting, hot metal cutting knife, etc. the mass production with aluminum alloy die-casting mould.

Forming-H21 steels can be formed using conventional methods.

Welding-H21 steels can be welded.

Heat Treatment-This process requires the H21 steels to be preheated to 816°C (1500°F) and then heated rapidly to 1177°C (2150°F). Then these steels should be held at the same temperature for 2 to 5 minutes and finally air cooled or oil quenched.

Forging-Forging of the H21 steels can be performed at 1150°C (2100°F) down to 927°C (1700°F) but not below 899°C (1650°F).

Cold Work-H21 steels can be cold-worked using conventional methods.

Annealing-Annealing should be performed at 885°C (1625°F) followed by slow furnace cooling at a temperature less than 4°C (40°F) per hour.

Tempering-Tempering of the H21 steels is performed at 593 to 677°C (1100 to 1250°F) to realize Rockwell C hardness of 54 to 36. A double tempering process is advisable and the parts should be maintained at same

High quality precision seamless pipe, the use of advanced production technology, strict quality control, strict control of technical parameters, so that the product is perfect

With Grade 10, 20, 30, 35, 45 and other high quality carbon steel 16Mn, 5MnV,65Mn , 12cr1movg,15crmo,35crmo,42crmo,50mnv act such as low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other joint steel

Widely used in engineering, chemical industry, urban construction, mechanical processing and other fields and scope Material density, through strict testing, to ensure that the use of safety.  Careful transportation, careful packing, so that the product in the transport process to get the best protection

We are a professional dealer in steel pipe industry, and through our excellent service and top quality products we have earned a very good reputation both at home and abroad.

Best service 
we are ten years team of steel business in export and import 

High quality
Passed the ISO9001:2008 quality system authentication and ROHS authentication.

Best price 
our price is not the lowest one, but with same quality lival, our goods price is best. 

Factory

Warehouse

All of our products are widely used in automotive parts, hardware parts,textile accessories, agricultural tools, electronics, chains, knives, electrical machine, stationary, rolling door, standard parts, clockwork feed. reaping hook, surge cane chopper, jungle machete, mud trowels, putty knife,air conditioning equipment cooling units,coater and creping blades, wood cutting band saw, jig saw,hole saw, lapping carriers, textile plates and needles, formed parts, springs, musical instrument reeds, vernier caliper, manual ruler, tape measure, motorcycle brake dics, automatic clutch patches, rolling shutter springs, horologe clockwork springs, lock making, shoes materials, hook materials, spin standard stamping, industrial knives,kitchen knives,slaughtering knives, scissors,razor,garden shears, saber, shims and washers for automobiles, petroleum fasteners, bearings and others.

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