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Gronz Metal Components
  • Supply of cold-/hotforged and CNC-machined metal (round) products
    • To standard specifications UNS/ASTM - DIN - BS - AFNOR - GOST
    • Specials according to technical drawing
  • Heat- & surface treatments and material coatings, on all metals
  • Advice on material and coating applications
  • Inhouse testing equipment like saltspray, UV testing, ultra thin layer thickness measuring etc.
  • Valves
  • Chemical industries
  • Maritime
  • Water treatment
  • Energy
  • Offshore & Shipbuilding
  • Oil & Gas
  • Food industries
  • Aviation &Aerospace
  • Rails & Construction
    We offer a wide variety of surface treatments, however we can also execute additional material treatments for you like heat treatment, annealing etc.
    Hot dip galvanizing
    Hot-dip galvanizing is a process that involves immersing the steel component to be coated in a bath of molten zinc (at about 450°C) after pickling and fluxing, and then withdrawing it. The immersed surfaces are uniformly coated with zinc alloy and zinc layers that form a metallurgical bond with the substrate. The resulting coating is/provides:
  • Durable, tough, abrasion resistant
  • Provides cathodic (sacrificial) protection to any small damaged areas where the steel substrate is exposed.
  • Layer thickness from 50-60 micron up to 200 micron.
  • Higher corrosion resistance than zinc plated, since the layer thickness is higher.
  • BS EN ISO 14713-1:2009 and NEN EN ISO 1461, process requirements under ASTM A123(strips and bars, plates, pipes and tubing, wire and reinforced bars & A153/F2329 (hardware).
    Powder coating
  • Inhouse production (complete powder coating line for large quantities)
  • For interior as well as exterior applications
  • Appropriate for color coding or enriching the look of metal components
  • 95% recovery efficiency of the powder by recycling during the automatic spraying process
    Duplex systems
    Duplex systems are commonly specified for aesthetic reasons but the combination of a powder coating layer over a hot dip galvanized layer also results in a far better coating:
  • 1.5 to 2.3 times the sum of the expected life of each system alone
  • Lower costs over life cycle project
  • Color code/enrich the look of metal components
  • Appropriate in very aggressive environments
  • The key to a successful duplex system is to properly prepare the galvanized surface for paint or powder according to ASTM D6386 and ASTM D7803.
    PTFE coatings
    PTFE (polytetrafluoroethylene) non-stick coatings are a primer/topcoat system. PTFE is available only in water-based liquid form. Types like Xylan® 5110, 1010, 1014, 1424 (on rotary actuators, valve balls, plug stems, clips, pins, piston castings, bearings, threaded components) give the best anti-corrosion result for wastewater/water treatment & offshore applications,
  • Inhouse production
  • Very low friction coefficient
  • Organic long lasting top coat
  • Good abrasion & chemical resistance
  • Working temp. range (continuous) -50°C/-58°F to 175°C/347°F
    Sherardizing ia a thermal diffusion process producing a sacrificial zinc/iron alloy layer providing long term, uniform and resilient anti-corrosion protection
  • Heat-resistent until 600°C
  • High abrasion resistance till HRC 41
  • Smooth matt grey uniform layer thickness, normal range 15 to 80 µm
  • Hydrogen brittleness excluded
  • BS EN ISO 14713-3: 2009 Zinc coatings
    Zinc plating/electro galvanizing
    Zinc plating / electro galvanizing is a very effective and economical way to protect your parts against corrosion.
  • Barrel and rack plating production lines to handle parts of every dimension
  • Comprehensive finishing processes: yellow- and blue passivated
  • 'Dickschicht passivating
  • Chrome 6-free
  • Heat resistant until 210° celcius
  • Processes meet or exceed the requirements of ASTM B 633/F1941.
  • Layer thickness from a few microns up to 20-30 microns
    Other coatings & Heat Treatments
    For other coatings and treatments or research on new coatings we dispose of expert knowledge and testing-& process methods. Send a message to or fill out our form.
    Contact us for professional advice on material (testing)/coating selection proceses. All our products we supply (if requested) with 3.1/3.2 EN 10204 material test certification.
    For coatings we can execute a large variety of tests:
  • Salt spray test ISO 9227/ Din 50021/ ASTM B117
  • UV test EN ISO 4892/16474
  • Vapor test EN ISO 6270-2
  • Ultra thin layer testing ASTM B568
  • Machu test
  • Microscopic analysis
  • Mech. test Taber Abraser ISO 9352
  • Pull-off test ISO 4624
bar steel rod
forged fittings
rotor shaft
studbolts xylan
weldinf neck flanges

Chemical composition in 2nd table
Werkstoff Short Description Tradename/ UNS DIN AISI/ ASTM BS GOST
1.0037Non-alloy structural steelSt.37-2Fe 360 B
1.0065Non-alloy structural steelSt.37-1A40 A 20
1.0305Non-alloy structural steelSt.35.8
1.0308Non-alloy structural steelSt.35
1.0402Quenched & Tempered steelC22070 M 2020
1.0425High-temperature structural steelHII1501 Gr.161-40016K, 20K
1.0460High-temperature structural steelC 22.8
1.0501Quenched & Tempered steelC35060 A 3535
1.0503Quenched & Tempered steelC 45080 M 4645
1.0570Non-alloy structural steelSt.52.3Fe 510 D1 FF17GS, 17G1S
1.0619High-temperature Ferritical steelGS-C 251504-161 Gr. B
1.0711Machining steel 9S20
1.0718Non-alloy high-grade machining steel9SMnPb 28K
1.1151Quenched & Tempered steelCk 22/ C22E055 M 1520
1.1156Ferritic steel castings for low temperaturesGS-Ck24
1.1181Quenched & Tempered steelCk 35/ C35E080 A 3535
1.1203Quenched & Tempered steelCk 55/ C55E2 C 55/XC 55 H 155

WerkstoffC%Si%Mn% P%S%Cr%Mo% Ni%Nb%Ti%
Chemical composition in 2nd table
Werkstoff Short Description Tradename/ UNS DIN AISI/ ASTM BS GOST
1.4000Ferritic stainless steelX6Cr13403 S 17O8Ch13
1.4016Ferritic stainless steelX6Cr17430 S 1512Ch17
1.4136Ferritic corrosion resistant cast steel high-alloyG-X70CrMo29 2
1.4523Ferritic corrosion resistant stainless steelS18235X2CrMoTiS18-2

WerkstoffC%Si%Mn% P%S%Cr%Mo% Ni%Nb%Ti%
Chemical composition in 2nd table
Werkstoff Short Description Tradename/ UNS DIN AISI/ ASTM BS GOST
1.4006Martensic stainless steelX12Cr13410 S 2112Ch13
1.4021Martensic stainless steelX20Cr13420 S 3720Ch13
1.4024Martensic stainless steelX15Cr13420 S 29
1.4034Martensic stainless steelX46Cr13420 S 4540Ch13
1.4057Martensic stainless steelX17CrNi16 2431 S 2920Ch17N2
1.4104Martensic stainless steelX14CrMoS17
1.4110High-carbon martensic stainless steelX55CrMo14
1.4119Martensic corrosion resistant stainless steelX15CrMo13
1.4122Martensic corrosion resistant stainless steelX35CrMo17/ X39CrMo17-1

WerkstoffC%Si%Mn% P%S%Cr%Mo% Ni%Nb%Ti%
Chemical composition in 2nd table
Werkstoff Short Description Tradename/ UNS DIN AISI/ ASTM BS GOST
1.3964Austenitic stainless steelAlloy 50/ Nitronic®X2CrNiMnMoNNb21 16 5 3
1.4301Austenitic corrosion resistant stainless steelX5CrNi18 10 / A2-70304 S 1708Ch18N10
1.4305Austenitic corrosion resistant stainless steelX10CrNiS18 9303 S 22/31
1.4306Austenitic corrosion resistant stainless steelX2CrNi19-11304/305 S 1103Ch18N11
1.4307Austenitic corrosion resistant stainless steel low carbonX2CrNi18-9
1.4308Austenitic corrosion resistant cast stainless steelG-X6CrNi18 9304 C 1507Ch18N9L
1.4310Austenitic corrosion resistant stainless steelX12CrNi17 7301 S 21/22
1.4312Corrosion resistant cast steel alloyG-X10CrNi18 8302 C 2510Ch18N9L
1.4401Austenitic corrosion resistant stainless steelX5CrNiMo17 12 2316 S 13/17/19
1.4404Austenitic corrosion resistant stainless steel low carbonG-X2CrNiMo17 12 2316 S 11/13/14
1.4408Corrosion resistant cast steel alloyGX5CrNiMo19 11 2316 C 1607Ch18N10 G2SM2L
1.4435Austenitic corrosion resistant stainless steelX2CrNiMo18 14 3316 S 11/13/1403Ch17N14M3
1.4436Austenitic corrosion resistant stainless steelS31600X5CrNiMo17 13 3316 S 19/31
1.4539Super austenitic corrosion resistant stainless steelN08904X 1 NiCrMoCu 25 20 5
1.4541Austenitic corrosion resistant stainless steelS32100X6CrNiTi18 10321 S 31/5106Ch18N10T
1.4571Austenitic corrosion resistant stainless steelS31635X6CrNiMoTi17 12 2320 S 18/3110Ch17N13M2T
1.4573Austenitic corrosion resistant stainless steelS31636X10CrNiMoTi18 12320 S 3310Ch17N13M3T
1.4580Austenitic corrosion resistant stainless steelS31640X 6 CrNiMoNb17 12 2318 S 1708Ch16N13M2B

WerkstoffC%Si%Mn% P%S%Cr%Mo% Ni%Nb%Ti%
Chemical composition in 2nd table
Werkstoff Short Description Tradename/ UNS DIN AISI/ ASTM BS GOST
1.4410Super duplex corrosion resistant stainless steel S32750 / Alloy 2507 X2CrNiMoN25-7-4
1.4462High strength duplex stainless steelS31803X2CrNiMoN22 5 3318 S 13
1.4501Super duplex corrosion resistant stainless steel S32760 / Alloy 100X2CrNiMoCuW N25 7 4X2CrNiMoCuW N25 7 4

WerkstoffC%Si%Mn% P%S%Cr%Mo% Ni%Nb%Ti%
Chemical composition in 2nd table
Werkstoff Short Description Tradename/ UNS DIN AISI/ ASTM BS GOST
1.6902Corrosion resistant cold-resisting cast stainless steel G-X6CrNi18 10
1.7102Alloyd spring steel for automotive54SiCr6
1.7335Creep resistant pressure vessel steel K1145713CrMo4-41501-620/62112ChM; 15ChM
1.7357Pressure vessel cast steelG17 CrMo 5 5
1.7380Heat resistant alloy steel10CrMo9 101501-622/51512Ch8
1.8159Quenched & tempered spring steel51CrV4735, H 5150ChFA

WerkstoffC%Si%Mn% P%S%Cr%Mo% Ni%Nb%Ti%
Example products
Tapped stud CNC
Tapped stud incl slotted nut SCM435, A453-660A-B, A193-B16, 13CrMo44, AISI 4140, Durehete 1055

dowel pin eccentric pin CNC
Dowel pin / Eccentric pin> A320 B8M, Duplex S31803, A437-B4B

blind flange Hot forged
Blind flange AISI 310, A193 B7, Hastelloy C276

Spur gear Hot forged
Spur gear Inconel 718, AISI 310, 21CrMoV5-7

stainless steel bars Bright
Stainless steel bars Aisi 321, A193 B8, DIN A2-70, Aisi 316L

cap screw u-bolt Drawing
Countersunck socket cap screws special tolerances DIn A4-80 & U-bolt after drawing AISI 304L

domed cap nut CNC
Domed cap nuts Super Duplex S32760, DIN A4-80

solid works metal parts CAD
We (reverse) engineer products with SolidWorks

Xylan 1424 PTFE
Studbolt incl 2 nuts PTFE silver coated

Product range

  • Fasteners
  • Flanges (& Gaskets)
  • Bar steel
  • Wire rod
  • Tubes & Pipes
  • Pistons
  • Shafts
  • Pins & Clips
  • Bearings & Gears
  • Rotors & Stators
CNC machining

From scratch to finished product:
Our network is fully integrated, so for many products we can offer you competitive prices and delivery times.

New materials

Gronz Metal Components is up-to-date on research & development about new materials and material coatings for sustainability and environmental improvement.

Looking for partners

We are developing an IT tool for a faster quotation system. Herefore we are looking for CNC manufacturers and (bar) steel forgings factories. You want to use your capacity more efficiently? Contact us now.


About us

Operating from Tilburg in the south of the Netherlands, more than a combined 20 years of experience in the field of fasteners, bar steel production, CNC manufacturing, marine industry, coating advice and applied coatings & testing assures
- product quality
- full traceability
- fast response
- reliable delivery times
- dedicated attention
for our customers.
Inquire now on the form below!

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